Comfort and fit - The elastic straps are made from breathable, perforated polyester cotton fabric to provide a comfortable fit. The adjustable strap lets you tailor the mask to your face shape for a secure, personalized fit. Training efficiency - The mask helps optimize lactic acid levels in your body, reducing fatigue and allowing you to intensify workouts while shortening your preparation time. Personalized progression - With 25 adjustment levels, the Hypoxia Mask lets you progress at your own pace, from beginner to advanced, ideal for optimizing altitude training. Endurance improvement - Scientifically proven that high-altitude training improves endurance. With the Hypoxia Mask, you can pursue similar performance gains to those athletes aim for before competitions. Use scenarios - During high-intensity interval training, tempo runs, or strength sessions to maintain training intensity with controlled breathing. - In altitude training programs or simulated altitude sessions to build cardiovascular capacity. - Pre-competition warm-ups to condition breathing and endurance.