The Phantom Training Mask is a training device that helps you to train muscles, you need for any sport… your breathing muscles. 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 increases your performance when training or competing without the mask.