Built for the last 10k.
A breathing resistance mask and an eight-week protocol for runners and everyday athletes. Ten minutes a day trains the muscles that quit before your legs do. Three resistance levels, an eight-week plan, and a test that shows you it worked.
$12.99 flat shipping · Ships from Dubai, no US delivery · 60-night guarantee · Three sizes
Placeholder pack shot. Final hero: a runner at 30k, mask on, real fatigue, light background.
BUILD NOTE: "47,200 athletes since 2016" pairs your verified Instagram community with your verified trading start. Replace with the real customer count from Stripe or the sales file before launch, it is the stronger number. Hero image is the archive pack shot until the reshoot: a runner at 30k, mask on, real fatigue, light background.
Start here
What are you training for?
Pick one and we will tell you exactly how the mask fits into your week.
Your breathing does not fall apart at 30k because you are unfit.
It falls apart because your breathing muscles have been working for two and a half hours and nobody ever told you they could get tired. When they do, your body pulls blood away from your legs to keep them going. The cadence goes, the form goes, and the last 12k costs you eleven minutes. The fix is not more mileage. It is training the thing that fatigued, ten minutes a day, on the easy days, for eight weeks before race day.
Between the sled and the run, breathing is what you lose control of first.
Hybrid events punish the transition, and the transition is a breathing problem before it is a strength problem. The protocol puts the mask on your zone 2 work and your seated sessions, never on the stations themselves, so your breathing muscles get loaded without your training getting slower.
Ten minutes a day, sitting down, on the lowest cap.
You do not need to be fit to start. Week one is five minutes seated. The protocol builds from there and it never asks you to run harder than easy. If you are coming back after time off, this is the one piece of training that does not require you to already be in shape to begin.
This will not acclimatise you. Only time at altitude does that.
We say it first because every trek operator will tell you the same thing and they are right. What a resistance mask can do is get your breathing muscles used to working hard before you go, so the effort of thin air is not the first time they have been loaded. That is a real preparation. It is not altitude preparation, and anyone telling you otherwise is selling you something.
What it does
Six things this mask actually does.
No mystery, no hype. Here is what you are buying.
Trains the muscles you breathe with.Your diaphragm and the muscles between your ribs are skeletal muscle. Load them and they adapt like any other.
Makes hard breathing familiar.Ten minutes a day under resistance, so the breathing at 30k is something you have practised, not something that happens to you.
Gives you three resistance levels.Four Holes, Two Holes, Single Hole. Start on Level 1, move up when your retest says so.
Comes with the plan.An eight-week protocol and a baseline test on day four, so you work from a number, not a feeling.
Fits inside the training you already do.Seated sessions and easy runs only. It never touches your hard days or your race.
Raises your ventilatory threshold and breathing endurance.In both controlled studies that measured it, the mask group's threshold rose significantly more than training alone. All five studies are on our evidence page.
How it works
You have muscles that move air. Almost nobody trains them.
Breathing is muscular work
Your diaphragm and the muscles between your ribs move around twelve thousand litres of air a day. They are skeletal muscle. They fatigue like skeletal muscle.
Fatigued breathing steals from your legs
When respiratory muscles fatigue hard enough, receptors in them trigger vasoconstriction that redirects blood away from your limbs. Physiologists call it the respiratory metaboreflex. Runners call it the wall.
Loaded muscle adapts
Three resistance levels add measured resistance so those muscles have to work harder. That is the entire mechanism, and there is nothing else in the box and nothing else in the claim.
The protocol
You do not buy a mask. You start a block.
Eight weeks, ten minutes a day, and you never run harder than easy. It starts with a baseline test on day four so you have a number, and ends with the same test so you can tell whether anything changed. Free in the box with every mask.
Sit down and get used to it
Five minutes seated on Level 1, Four Holes. Day four is your baseline test.
Build
Ten minutes daily plus one easy run wearing it.
Retest
Same test, same conditions. Progress a cap only if you earned it.
Load
Ten minutes daily plus two easy sessions. Week 8 retest closes the block.
Included with every mask
The app that keeps the score.
Runner's Age, a Load ring and a Recovery ring every morning, one switch to say whether the mask was on, and a screen that shows what the mask costs you on the same easy run and how that cost falls over eight weeks. Fed by Garmin, Coros, Whoop, Fitbit or Oura. A coach that reads your log and never claims the mask did it alone.
Day one, unedited
This is what the first session actually looks like.
No music, no cut, including the bit where she takes it off.
Where this sits
An honest comparison, including the options that beat us.
| Option | Price | What it actually does | Programme |
|---|---|---|---|
| Just run more | Free | The highest-return thing available to you. If you have the hours, do this first. | n/a |
| Cheap masks on Amazon | $15 to 30 | Airflow resistance, plus altitude claims that are not true. | None |
| Altitude Resistance Mask | $49.99 | Airflow resistance across three levels, three sizes, claims limited to what the evidence carries. | 8-week protocol and baseline test |
| Threshold inspiratory trainers | $60 to 350 | Stronger evidence for the format. Trains inhalation only, seated, not while you run. | Varies |
| Real hypoxic generators | $1,900+ | Genuinely reduces oxygen. This is what altitude training actually costs. | None |
If measured inspiratory strength is your only goal, buy a threshold trainer. If you want breathing work built into your running week, this is that.
The guarantee
Finish four weeks. No improvement, keep it and we refund you.
Complete weeks one to four and retake the baseline test. If your number has not improved, send us the two test cards and we refund you in full. You keep the mask.
We ask you to finish four weeks because a mask in a drawer cannot do anything for anyone. And if it genuinely does not work for you, we would rather find out than keep your money.
From the community
Real sessions, from real people.
Not ready yet
Two minutes. Find your starting cap.
The most common reason people quit in week one is starting too hard. Six questions and we tell you which level to start on, how long your first session should be, and when to progress. You get the result whether or not you give us your email.
Or just get the mask
$49.99 $89
Mask, three resistance levels (a pair of caps for each), three base pieces, neoprene sleeve, the 8-week protocol. Three sizes.
Shop
Everything starts with the same mask.
The bundles add spare parts and a dated protocol, not a different product. If you are unsure, buy the first one.
Altitude Resistance Mask
Silicone mask, six air resistance caps, three base pieces with flux valve plungers, neoprene sleeve, the 8-Week Protocol, baseline test card. Black or white. Sizes S, M, L.
$49.99 $89
Altitude Pro Resistance Mask
The same mask plus three all-terrain filter caps for sand, dust and water. Trail, desert and open-air training where the standard caps let the environment in. Black or white. Sizes S, M, L.
$69.99 $99
Runner Bundle
The mask plus a spare neoprene sleeve, a spare cap set, and the printed race-week breathing card.
$69.99 $79.99
Race Prep Bundle
The Runner Bundle plus an 8-week protocol dated backwards from your race, and a place in that month's cohort.
$79.99
Club and Coach Pack
Six masks, a coach guide, a group baseline sheet, 30% off for your members. Sold through a conversation, not a cart.
$249 $299
Gift Box
The mask in gift packaging with the protocol as a printed booklet and a card you can write on. No price anywhere on it.
$59.99
Neoprene Sleeve
Replace roughly every three months with daily training.
$9.99
Air Resistance Cap Set
All three levels, a pair of caps for each. For a lost one, or a second user.
$12.99
Base Pieces with Flux Valves
Set of three. The valve plungers are the part that wears with daily use.
$11.99
The 8-Week Protocol, printed
Free in the box with every mask, and free digitally to anyone who asks.
$9.99
BUILD NOTE: prices are modelled, not final, and move once landed cost is confirmed. Shipping is a flat $12.99 on every order. Do not discount the mask below $49.99; it is already the floor, discount the bundles instead.
Altitude ™ · SKU AM-01 · Black or white
Altitude Resistance Mask
Train the muscles you breathe with. Eight weeks, ten minutes a day, and a test that tells you whether it worked.
$49.99 $89
$12.99 flat shipping · Ships from Dubai in 1 to 2 working days · No US delivery
Model
Colour
Size, by body weight
60-night guarantee · Free size exchange within 30 days
- 1 silicone training mask
- 3 all-terrain filter caps: sand, dust, water
- 3 resistance levels: Four Holes, Two Holes, Single Hole (a pair of caps for each)
- 3 base pieces with flux valve plungers
- 1 neoprene sleeve
- The 8-Week Protocol, printed and digital
- Baseline test card
- Safety and first-use guide
Compare Standard and Pro
| What is in the box | Standard | Pro |
|---|---|---|
| 1 silicone training mask | ✓ | ✓ |
| 6 air resistance caps, progressive | ✓ | ✓ |
| 3 base pieces with flux valve plungers | ✓ | ✓ |
| 1 neoprene sleeve | ✓ | ✓ |
| The 8-Week Altitude Protocol, printed and digital | ✓ | ✓ |
| Baseline test card | ✓ | ✓ |
| Black or white | ✓ | ✓ |
| Sizes S, M, L by body weight | ✓ | ✓ |
| 60-night guarantee, free size exchange | ✓ | ✓ |
| $12.99 flat shipping | ✓ | ✓ |
| 3 all-terrain filter caps | ✕ | ✓ |
| Sand resistant | ✕ | ✓ |
| Dust resistant | ✕ | ✓ |
| Water resistant | ✕ | ✓ |
| Screw-on filter chamber, three-part cap | ✕ | ✓ |
| Trail, desert and open-air training | ✕ | ✓ |
| Price | $49.99 | $69.99 |
What it does.
Six things, all of them true.
Loads the muscles you breathe with.Diaphragm and intercostals, working harder on every breath.
Makes hard breathing familiar.Practised under resistance, so it is controlled on race day.
Three resistance levels.Four Holes, Two Holes, Single Hole. Progressive resistance you set, from Level 1 upward.
The 8-week protocol in the box.Baseline test on day four, retest at week five and week eight.
Ten minutes a day.Seated sessions and easy runs. Never your hard days, never your race.
Raises ventilatory threshold and breathing endurance.Both controlled studies that measured it found the mask group improved significantly more than training alone.
What it does
It makes breathing harder work, on purpose, in measured steps.
Your diaphragm and intercostals move every breath you take. Load them and they respond the way muscles respond to load. What the mask adds over a breathing exercise is measurement and progression: three resistance levels, three base pieces with flux valve plungers that let you breathe out freely while loading the breath in, a starting point chosen for you rather than guessed, and a test on day four and day twenty-eight so you are working from a number instead of a feeling.
Resistance
Three levels. Everyone starts on the first one.
Level 1 is where everybody starts, including people who are certain they will not need to. You move up only when three consecutive sessions feel controlled and your week-four check says so. Starting high is the single most common reason people abandon this kind of training in week one.
BUILD NOTE: replace the level descriptions with your measured pressure drop per level once bench-tested. "Single Hole, 2.4 kPa at 60 L/min" beats "Level 3", and no competitor publishes it.
First use
Day one is five minutes, sitting down.
Fit the mask with the Level 1 caps, Four Holes. Breathe normally for five minutes. That is the entire first session. If you feel dizzy or light-headed, take it off and stop for the day. Day two, five minutes seated. Day three, ten minutes seated. Day four is your baseline test, and the protocol takes over from there.
Evidence
What the research says, including the parts that do not help us.
Five controlled studies have tested masks like this one. Four found no VO2max advantage over a control group. One, the largest and longest at 44 athletes over eight weeks, found a significant advantage on VO2max and on both ventilatory thresholds. The two studies that measured threshold markers both found a significant advantage for the mask, and threshold is the number that matters for a recreational runner, because it is the intensity you can hold before breathing becomes the limit.
We show you all five. No study has yet tested this product specifically or used a dummy mask as a control. We are commissioning that trial and will publish it whichever way it goes.
Care
Sizing, cleaning and durability
Three sizes by body weight: small 45 to 59 kg, medium 60 to 99 kg, large 100 kg and above. On a boundary, take the larger. Rinse the neoprene sleeve after every session, wash weekly in warm water with mild soap, air dry. Replace the sleeve roughly every three months with daily training. The valve plungers in the base pieces are the part that wears; a spare set is $11.99. Caps last indefinitely unless lost; a full set of all three levels is $12.99.
Ready
Altitude Resistance Mask
$49.99, everything in the box, three sizes, and a guarantee that asks you to actually use it.
The science
Every study we rely on. Including the ones that do not help us.
Most brands in this category cite journal names without showing results. Here are the studies, the numbers, and the ones that found nothing.
How it works
Breathing is done by muscles. That is the whole idea.
Your diaphragm sits under your lungs and does most of the work of breathing. The intercostals between your ribs do the rest. They are skeletal muscle, the same tissue as your quads, and they respond to load and fatigue under it.
When they fatigue hard enough during exercise, receptors inside them signal your nervous system to constrict blood vessels elsewhere. Blood that was going to your legs is redirected to keep your breathing going. This is established respiratory physiology called the respiratory muscle metaboreflex. In lab work where researchers artificially unloaded people's breathing muscles, exercise duration rose 10 to 20 percent and leg fatigue fell 25 to 30 percent.
What the mask adds is a calibrated aperture. Smaller hole, more work to move air through it. Six of them, in measured steps, so you start where you should and progress when you have earned it. That is all it is.
The evidence
The five controlled studies on masks like ours
| Study | People | Weeks | VO2max vs control | Threshold vs control |
|---|---|---|---|---|
| Abouzeid et al. 2023 | 44 | 8 | Significant | Significant |
| Porcari et al. 2016 | 24 | 6 | No difference | Significant on RCT |
| Biggs et al. 2017 | 17 | 6 | p = 0.075 | Not measured |
| Warren et al. 2017 | 14 | 7 | p = 0.34 | Not measured |
| Sellers et al. 2016 | 19 | 6 | p = 0.451 | Not measured |
Four of five found no VO2max benefit, which is why we will never tell you this raises your VO2max. The two that measured ventilatory threshold both found a significant advantage for the mask group. Nobody else measured threshold at all, so the popular verdict that these masks do nothing rests almost entirely on VO2max data.
Porcari et al. 2016, Journal of Sports Science and Medicine
Twenty-four people, randomised, six weeks of high-intensity cycling. VO2max improved in both groups with no significant difference between them. Respiratory compensation threshold rose 10.2% in the mask group against 1.0% in controls, and power at that threshold 16.4% against 4.0%, both significant between groups. Ventilatory threshold rose 14.0% against 2.1% but that comparison landed at p = 0.06.
We quote that in full because it is the honest description of this product. It is the sentence critics use against the category, and we think it is a product description.
Abouzeid et al. 2023, IJERPH
Forty-four male university athletes, 22 training in a mask and 22 without, eight weeks. The authors report significant benefits favouring the mask group in FVC, FEV1, VO2max, and both ventilatory thresholds with their power outputs. Two caveats we will not bury: the paper does not state that allocation was randomised, and there was no dummy mask. It is one study whose VO2max finding disagrees with four others, so we show it next to them rather than alone.
The three that found nothing
Biggs 2017, 17 people, VO2max between groups p = 0.075. Warren 2017, 14 cadets, p = 0.34. Sellers 2016, 19 cadets, p = 0.451 on VO2max and p = 0.576 on time to exhaustion, and in that study the control group improved more than the mask group. We show you these because you would find them anyway, and because a brand that publishes only its favourable studies has told you something about itself.
The wider evidence on training breathing muscles
A 2012 meta-analysis in Sports Medicine found respiratory muscle training improved endurance performance by 16% on constant-load tests and 18.5% on intermittent incremental tests, with larger gains in less fit people than in highly trained athletes. A 2013 meta-analysis of 21 randomised trials in 426 athletes found significant improvements in time trials, exercise endurance time and Yo-Yo test repetitions, and no change in VO2max.
The caveat that belongs in the same breath. Those trials used dedicated threshold inspiratory trainers, not masks worn during exercise. They establish the training principle. They are not evidence about this product, and we cite them as the reason the product exists rather than as proof that it works.
What we would have to do to say more
Eight weeks, at least 60 recreational runners, randomised into three groups: this mask, a dummy mask with the resistance removed, and no mask. Primary outcomes ventilatory threshold and time to exhaustion. We are commissioning it and committing here to publish the result whichever way it goes.
Last updated 10 September 2026. Updated when new evidence appears, in either direction.
The Altitude Protocol
Eight weeks. Ten minutes a day. You do not run more.
This is the part competitors do not give you, and it is why their masks end up in drawers. Free in the box with every mask.
Familiarisation and baseline
Day 1 and 2, five minutes seated on Level 1. Day 3, ten minutes seated. Day 4, your baseline test, written on the card. Days 5 to 7, ten minutes seated. No running in the mask this week.
Build
Ten minutes daily on your working level, plus one easy run wearing it. Easy means conversational. If you cannot talk, the mask comes off.
Build
Same as week 2. This is the week most people quit, usually because they moved up a level too early. Do not move up yet.
Consolidate
Ten minutes daily plus one easy session. Prepare for the retest: same time of day, same warm-up, not after a hard session.
Retest and progress
Repeat the baseline test in the same conditions. Improved? Move up one level. Unchanged? Stay where you are, or take the guarantee.
Load
Ten minutes daily plus two easy sessions in the mask.
Load
Same again. Still nothing hard, still nothing that matters, still no racing.
Final retest
Third number on the card. Then two weeks off breathing work before you run the block again a level higher.
What the protocol never asks you to do. Wear it for intervals, threshold work, a race, or any session you care about. Wear it while driving, road cycling or swimming. Or start above Level 1, whatever you think of your own fitness.
Why it is built this way
Every number here came from the research, not a marketing meeting.
| Design choice | Why |
|---|---|
| Eight weeks, not four | Strength changes in the respiratory training literature appear around three to four weeks, but endurance and exercise tolerance changes generally need four to eight weeks or more. A four-week product would sell more easily and under-deliver. |
| A baseline test on day four | Without a number on day one you cannot know whether anything changed. It is also what makes the guarantee testable rather than rhetorical. |
| Retest at week five | Testing earlier produces noise and a false verdict in both directions. The two mask studies that found threshold improvements ran six and eight weeks. |
| Ten minutes, not thirty | Trial protocols are short and frequent, typically around thirty breaths once or twice a day. Adherence decides outcomes, and long sessions destroy adherence. |
| Progress by test result | Load in the studies is prescribed as a percentage of the individual's own inspiratory strength and re-set as they improve. A fixed schedule ignores the person doing it. |
| Easy sessions only | Adding restriction at an intensity you are already limited at does not add stimulus, it degrades the session. The Porcari mask group also rated sessions as harder, which is a cost on days that matter. |
| Two-week deload | Standard training principle. Respiratory muscles are skeletal muscle and continuous loading without a break accumulates fatigue rather than adaptation. |
Reviews
Reviews with the training attached.
Every review shows the sport, weekly volume, weeks used and what the retest said, including when it said nothing.
BUILD NOTE, IMPORTANT: every number above is a placeholder and must be replaced with a real figure or removed before launch. Countries shipped to and trading since 2016 come from the sales history and are true. Rating, review count and completion rate cannot exist until real customers generate them.
We publish the bad ones. Every review goes up, including one and two star, unedited except for removing personal details. A review page where everybody is delighted is a page nobody believes.
[FORMAT EXAMPLE, NOT A REAL REVIEW. Replace with a verified review that mentions starting level and retest result.]
[FORMAT EXAMPLE, NOT A REAL REVIEW. Keep one slot for a four star or lower review naming a genuine flaw.]
[FORMAT EXAMPLE, NOT A REAL REVIEW. A coach or club leader review carries more weight with a sceptic than an anonymous one.]
Proof you already own
Trust is earned with things you can verify.
Three things are true today and need no waiting: a community of 47,200 on Instagram, orders shipped since 2016, and the countries those orders went to. Athlete endorsements are a fourth, only where a signed agreement still covers the use, and never as the hero.
How this page fills up
Reviews app installed before the first order ships.
Check-in email catches problems before refunds.
Retest email, then the review request that asks what the retest said.
Target: 50 verified reviews, half with photos.
Fit, sizing and safety
Get the fit right and most problems never happen.
Sizing
Three sizes, fitted by body weight rather than face measurement: small 45 to 59 kg, medium 60 to 99 kg, large 100 kg and above. On a boundary, take the larger one, because a mask that is slightly loose can be tightened at the harness and one that is too small cannot be made bigger. Wrong size? Free exchange within 30 days with a prepaid label, one per customer, no argument.
Cleaning
Rinse the neoprene sleeve after every session. Wash weekly in warm water with mild soap and air dry away from direct heat. Replace the sleeve roughly every three months with daily training. Wipe the mask body and caps. The valve plungers in the base pieces wear with use; a spare set is $11.99.
Safety
Read this before your first session
Start on Level 1, seated, for five minutes. Stop immediately if you feel dizzy, light-headed, nauseous or unwell, and do not resume that day. Never use the mask while driving, cycling on roads, swimming, lifting heavy loads unsupervised, or anywhere a loss of attention or balance would be dangerous.
Speak to a qualified clinician before using this product if you have any respiratory condition including asthma or COPD, any cardiovascular condition, uncontrolled high or low blood pressure, a history of fainting or dizziness, anxiety around restricted breathing or claustrophobia, or if you are pregnant. Not for use by children. We cannot give medical advice.
The Altitude Resistance Mask does not reduce the oxygen content of the air you breathe. It adds resistance to airflow. It is not a medical device and is not intended to diagnose, treat, cure or prevent any condition.
Run clubs, coaches and gyms
Run a four-week breathing challenge with your group.
Six masks, a group baseline sheet, a coach guide, and a protocol your athletes follow alongside their normal training.
What you get
Six Altitude Resistance Masks at $249, a printed coach guide, a group baseline and retest sheet, a co-branded four-week challenge kit, and 30% off for any member who wants their own.
What we ask
Run the challenge properly, let us film some of it, and give us honest feedback including the parts that go badly.
What we will not do
Make performance claims to your athletes, sell to them during your sessions, or ask you to endorse something you have not used. We say on our own homepage that this does not simulate altitude, so we will not say otherwise to your group.
Request the pack
Tell us about your group
Name · Club, gym or team · Your role · Active members · What they are training for · City and country · Anything else
BUILD NOTE: this is a form, not a cart. Club orders close on a conversation. Route to a human inbox with a 24-hour reply commitment.
About
About Altitude.
Shipping and returns
We ship from Dubai, UAE, to the GCC, UK, Europe and most other countries. We do not ship to the United States. GCC 2 to 4 working days, UK and Europe 5 to 8 working days, all tracked. Duties and import charges are calculated at checkout so nothing unexpected arrives with the parcel. Shipping is a flat $12.99 on every order.
Free size exchange within 30 days with a prepaid label. Standard returns within 30 days in resaleable condition. And the 60-night guarantee: complete four weeks of the protocol, retake the baseline test, and if your score has not improved send us the two test cards for a full refund. You keep the mask.
The Altitude Athlete app · included with every mask
Your run, your numbers.
One daily distance for your level, one switch that says whether the mask was on, and a screen that shows what the mask is costing you and how that cost shrinks over eight weeks. Signed in with your order email. Fed by your watch.
Web app at launch, iPhone and Android to follow. Works with Garmin, Coros, Whoop, Fitbit and Oura.
Every morning
Two rings and today's run.
Load is this week's work against the block's plan, with the share the mask carried. Recovery is your readiness out of 100 from your own HRV, resting heart rate and sleep, and it tells you plainly: run as planned, keep it easy and hold the level, or rest. Under them, today's session with the one number to stay under.
Log it by hand or let your watch send it. The moment a run exists for the day, the card turns green and the block moves on.
The comparison the product is about
With the mask. Without it. The cost.
Six numbers from your own easy runs, side by side: pace, heart rate, aerobic efficiency, recovery drop, session load and load per minute. The third column is what the mask costs you today, and under each one, what it cost in week one.
The mask makes the same easy run cost more. Your watch shows it. What the block shows is that cost coming down, which is your breathing muscles adapting. We never turn it into an equivalence with a longer run, because it is not one.
The block
Same run every day. Level up every few weeks.
Two no-mask runs set your baseline. Then six masked runs a week at your distance, easy pace, with the resistance stepping up in fixed blocks and a no-mask check in the middle. Eight weeks for most people; a 21-week version that sits under a full marathon plan and never touches a long run, an interval session or the race.
Logging
One switch. Mask on or off.
That is the only question the app asks. Type the run in, or pull it from your watch and add a breathing score. Runs without the mask fill the without column; in a test week your fastest one becomes your test, the number the guarantee uses. Nothing to categorise, nothing to remember.
Each connection reads your runs and heart rate only, never location history or sleep detail, and can be removed in one tap.
Runner's Age and the coach
One number for where you are. One voice that reads your log.
Runner's Age takes your age and moves it by what your running says: VO2max from your watch, resting heart rate, HRV, lactate threshold, aerobic efficiency, your test time and recovery drop. Every adjustment is printed next to the number, with a confidence tag that tells you how much of it your wearable is feeding. It is your trend over the block, not a diagnosis.
The coach explains the block from your own numbers, tells you when to hold a level, and answers what the mask is costing you today. It never gives medical advice and never claims the mask did something on its own.
Included
In the box, and in the app.
Every mask comes with the block, the log, the coach and the 60-night guarantee: finish 40 of 48 masked runs, and if your final no-mask run is not faster than your baseline, full refund, keep the mask. The app is how you prove it to yourself.
FAQ
The questions we actually get.
Does it really simulate altitude?
No. The air going through it is the same 20.9% oxygen as the air around you. The best controlled study on a mask like this concluded it acts more like a respiratory muscle training device.
Will it increase my VO2max?
Almost certainly not. Four of the five controlled studies found no VO2max advantage over training without a mask. One found a benefit. We are not going to build a product page on the one that agrees with us.
Which size am I?
By body weight: small 45 to 59 kg, medium 60 to 99 kg, large 100 kg and above. On a boundary, take the larger. Wrong size, free exchange within 30 days.
It looks uncomfortable.
It is not comfortable, and we are not going to tell you it is. It is a training load. What it should never be is painful, tight at the harness, or leaking at the seal. If it is any of those three it does not fit, and we exchange it free.
Will I be able to breathe in it?
Yes. On Level 1, seated, most people forget they are wearing it after two minutes. The people who cannot breathe in it are the people who started on Level 3 because they run 50k a week.
I am not an elite athlete.
Neither is almost anyone using this. The protocol is built for someone training six to eight hours a week with a job. The evidence on respiratory training is also clearest in less fit people, not elites.
I already have a training plan.
Keep it. This does not replace a single session. Ten minutes a day seated, plus one or two easy runs a week wearing it.
Will it slow me down?
On the runs you wear it for, yes, which is exactly why the protocol only puts it on easy sessions. Never race in it.
Is this not just a gimmick?
Most of this category is, and that is a fair place to start. Here is the entire mechanism: breathing is done by muscles, resistance makes them work harder, muscles adapt to load. Here are all five studies including the three that found nothing. Judge it on that.
Why not just run more?
If you can run more, run more. It is the highest-return thing available to you. This is for people already at the volume their life allows.
Why is this better than a POWERbreathe or an Airofit?
On evidence, threshold inspiratory trainers have a stronger literature behind their format, and we say so. What they do not give you is a device you can wear while you train, a protocol built around endurance training, or this price. If measured inspiratory strength is your only goal, buy theirs.
Is it safe?
Start on Level 1, stop if you feel dizzy or light-headed, never use it while driving, road cycling or swimming. If you have a respiratory or cardiovascular condition or you are pregnant, speak to a clinician first. We cannot give medical advice.
Do you ship to the United States?
No. We are not able to sell into the United States and we do not accept US orders. Everywhere else we ship from Dubai, tracked, with duties calculated at checkout.
Where do you ship from and how long does it take?
Dubai, to most of the world. GCC 2 to 4 working days, UK and Europe 5 to 8, tracked, duties calculated at checkout. We do not ship to the United States.