Zora0923 High Altitude Mask, Training Workout Mask Men to Improve Lung Capacity, 24 Level Breathing Resistance Fitness Mask to Upgrade Endurance, for All Sport: Running, Cardio, Cycling, Gym, HIIT.

Our sports mask to simulate exercising in high altitude environments, 24 Breathing Resistance Level 2 Air flow pathes Improve lung capacity by creating pulmonary resistance Suitable for almost any sport type. For example, running, football, basketball, rugby, track and field, fitness, jogging etc. Made of high quality material, Its very strong enough for long time use. One size fit all Luxury box packaging, ideal for gift. Only for Fitness. NOT for Convid19 ！.