Outdoor Ski Motorcycle Cycling Balaclava Full Face Mask Neck Cover Ultra Thin black_adjustable

Description

-- Mask by restricted access to the volume of air to limit oxygen volume, enhance the intensity of training. -- Improve muscle strength, help to burn fat, also can improve the main basal metabolic rate. -- Anaerobic conditions improve explosive increase of cardiopulmonary function and endurance. -- To achieve the simulation of altitude training or enhance the function of breathing muscles.