Description: Sport Face For Breathing High Altitude Oxygen Trainer w/ 6 Level Air Flow Item Specifics: Type: Sport Face Color: Black Gender：Unisex. Size:One Size （Flexible） Material:Silicone +Composite Fabric+ABS. Features: -The athletic breathing has a comfortable, edible silicone that fits snugly against the face. -Workout has breathable and 6-position adjustment lever to adjust the resistance, silicone breathing material more clean and safe, more obvious effect of oxygen barrier. -Oxygen-inhibiting workout s can effectively improve your oxygen intake. Self-abuse training exercises your heart and lungs, fitness, endurance and explosiveness to stimulate your body's wireless potential. -Exercise to increase the difficulty of workout can get rid of fat, better shape. The workout is suitable for cycling, climbing etc. Trainer are good for the maintenance of muscle strength in cardiopulmonary function. -The oxygen barrier Oxygen Trainer has 3 accompanying resistances and 6 levels adjustments. The product is newly upgraded and is an efficient training aid for trainers and athletes. Through airflow design, simulate the altitude environment of the plateau,thin air and low oxygen content can effectively exercise vital capacity, heart load intensity, physical fitness, endurance and explosive power. During the training, the oxygen will become more rapid and difficult to breathe. The increase of breathing resistance will greatly improve the human body's function in such a strong environment. Package Included: 1x Sport Face 1x Box Note: 1.Please allow 1-3cm error due to manual measurement. Please make sure you do not mind before you bid. 2.The colors may have different as the difference display, please understand.