The Phantom Training Mask has four different levels of difficulty: Beginner, Advanced, Professional and Extreme. It allows you to effectively train your breathing muscles and improves your stamina. It helps you to strengthen your diaphragm and your intercostal muscles. The Phanton Training Mask is made of medical silicone and nylon, the Phantom Regulation System (PRS), the Xhale Valve, the cover and the sleeve.
