Do you want to have a healthy body? Do you want to break yourself? If you want to, then challenge it.What is a mask for training?The air intake amount is determined by different intake valves, and the different intake air amounts correspond to the air thinness at different altitudes. In order to achieve best training or enhance the function of the respiratory muscles.The reasons for choosing us are as follows:1. Material: high quality cotton + food grade silica gel ( clean and safe and obvious oxygen barrier effect )2. Size: M is suitable for most people ( weight: 120-200lbs )About mask:The mask uses advanced technology to improve heart and lung function.Suitable for hiking/jogging/biking and other sports. Turn the dial to the far left, breathing resistance is small and smooth. On the other hand, if you dial the dial on the right side of the mask cover, the breathing resistance will increase and the challenge will be bigger and bigger.Feedback:Please leave your valuable comments on any problems with our products. Your feedback is our greatest motivation to do our best.
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