Small Device, Big Job
The GO² Device for Endurance is a deceptively simple piece of patented technology: it sits comfortably in your mouth while you train and race, training your breathing muscles so your body uses oxygen more efficiently. The result is scientifically proven performance — endurance up 6%, VO₂ max up 4%, and a lower heart rate at the same effort. But like any piece of performance gear, it works best when it's fitted right and looked after well. Here's how to get the most out of yours.
Get the Fit Right
Fit is everything. A device that shifts around or feels awkward will distract you when you should be focused on your stride. Before your first real workout, do this:
- Try it on at home first. Wear the device for a few relaxed minutes — around the house, not mid-interval — so the fit feels natural before you add effort.
- Check the seal and comfort. It should feel snug and secure without forcing your jaw open. If it slips, adjust and try again; a settled fit makes breathing easy and hands-free.
- Do a test run. Take it out for an easy jog. You should be able to breathe rhythmically through it without thinking about it by the end of the warm-up.
- Check your bands. The fit system uses replaceable bands — if they ever feel stretched or loose over time, swap in fresh ones. A fresh set restores that locked-in feel.
Build It Into Your Training
GO² isn't race-day-only gear — it's a training tool. Wear it on easy runs, tempo sessions, and long efforts alike so breathing through it becomes second nature. Consistency is what turns the patented breathing-resistance design into race-day results. Athletes like Joseph Gray, Don Bowie, Ricardo Urbina, and Laurel Wassner didn't get to the top by skipping reps, and the same logic applies to your breathing muscles.
Care Takes Thirty Seconds
After every session, give your device a quick rinse with clean water to clear sweat and saliva. Shake off the excess, let it air-dry, and store it somewhere cool and ventilated — not sealed in a sweaty gym bag. That's genuinely it: no special cleaners, no complicated maintenance. Rinse, dry, store. A clean device is a comfortable device, and a comfortable device is one you'll actually wear.
When to Replace
The GO² device itself is built to last — it has no expiration date, unlike the $295 carbon-plated shoes that lose their pop after ~150 miles. The only consumable is the fit: replacement bands are inexpensive and easy to swap, so your device can keep delivering that snug, proven fit season after season. Compare that to $59.95 once for the GO² — about $0.10 per second of marathon time saved — and the math is as comfortable as the fit.
Your Next Workout, Upgraded
A great fit and simple care routine mean one thing: you stop thinking about the device and start feeling what it does — steadier breathing, a calmer heart rate, and endurance that holds up when the miles get long. GO² is the only breathing device scientifically proven to increase oxygen and endurance while lowering heart rate. At $60, it's the cheapest seconds-per-dollar upgrade in endurance sport.