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