Hypoxia Mask - Comfortable, breathable fit: elastic straps made of perforated polyester cotton fabric provide a secure, comfortable feel. The adjustable strap lets you tailor the fit to your face shape for a personalized, secure seal. - Improve training efficiency: helps optimize lactic acid levels in your body, reducing fatigue and enabling you to intensify workouts while shortening preparation time. - Personalizable progression: 25 adjustment levels let you progress at your own pace from beginner to advanced, making it suitable for optimizing altitude training. - Build endurance and performance: high-altitude training is associated with endurance gains; with the Hypoxia Mask you can work toward improved athletic performance similar to what professional athletes pursue before competitions. - Practical use scenarios: - Pre-workout warmups and interval sessions at the gym to simulate altitude and push effort limits. - Endurance training during runs or cycling to improve oxygen efficiency. - Structured altitude-training programs for athletes preparing for events.