Breathing through your nose is essential for optimal Oxygen absorption to the Brain, Blood, and Muscles. AC Performance Systems created this patented Breathing Band to keep your Nose wide open throughout your hardest workout. So you can do what you came to do. Push yourself. Breathe Correctly. Experience The difference. At the Gym, Yoga Studio, Cycling, Racing Motorcycles, Running, Stadiums, Pilates, Hiit, kickboxing, or anything that gets your heart rate up- you shouldn’t have to struggle with your body’s natural inability to nose breathe. Now you don't have to. Love it or your money back.