The Phantom Training Mask is a training device that helps you to train breathing muscles which you need for any sport. The breathing process is essential for any physical activity, yet we pay little attention to it. This changes with the Phantom Training Mask. It sets your focus on your breathing by limiting your air supply during training. This makes it harder to get your lungs filled with air and strengthens your breathing muscles which increase your performance when training or competing without the mask. The Phantom Training Mask is equipped with (Phantom Regulation System) which offers four levels of resistance, from Beginner to Extreme, to constantly push your limits. The Phantom Training Mask:Train your breathing muscles and increase your performance in any sport.Change resistance levels easily during training without taking your mask off.Ultra lightweight, anatomically designed sleeve that will not slip during training.Use of only the best, hygienic and anti-allergic materials.Customize your mask with exchangeable covers and sleeves. Easy to disassemble, clean and wash.