Comfortable fit and material: The elastic straps of the sports breathing mask are made of breathable, perforated polyester cotton fabric to provide a comfortable fit. Training efficiency: The training mask optimizes lactic acid levels in your body, reducing fatigue and allowing you to intensify workouts while shortening preparation time. progression: With 25 adjustment levels, the hypoxia mask helps you progress at your own pace, from beginner to advanced, ideal for optimizing altitude training. Endurance and performance: Scientifically proven that altitude training can improve endurance. With the Hypoxia Mask, you can train to improve athletic performance before competitions, similar to how professional athletes prepare. Use scenarios: Endurance cardio sessions such as running, cycling, or rowing intervals to build stamina. intensity interval training and circuit workouts to push capacity while managing breathing. Precompetition altitudestyle conditioning for runners, cyclists, and team sport athletes preparing for events.