Nextgen Cardio Breathing & Respiratory Strength Trainer 24 - Altitude Workout Mask for Oxygen DeprivationNeoprene Imported SIMULATE HIGH-ALTITUDE TRAINING: Boost your lung capacity, improve your stamina, and break through your limits with our workout maskCHOOSE YOUR INTENSITY LEVEL: Personalize your training with 24 resistance levels designed for beginners to prosFITS COMFORTABLY: Our universal fit sleeve and anatomical grip mask make this exercise mask fully functional without compromising comfortEASY TO CLEAN: Use our included cleaning spray and cloth to maintain hygiene after each workoutBUILT TO LAST: Our gym mask is made of ultra-durable ABS plastic and comes with a zipper case for easy storage and transport