Exercise mask-limiting oxygen intake-black The product is shipped based on the color or size of the main image of the product page. Take the training to new heights with a training mask that limits your oxygen uptake. bros is our unique exercise mask that limits oxygen uptake, which increases your lung capacity. Using this kind of exercise mask can be compared to high-altitude training. In addition to the fact that the mask is effective in cycling, for example, when it trains up your lungs to be able to can do more, you can use it in favor of a high-altitude climb. The exercise mask is developed with several layers that filter bacteria and give you a clean inhalation. In order for the mask to sit comfortably across the face, it is equipped with an elastic band that goes over the nose lot. - ize training - oxygen uptake, increase your lung capacity - as high-altitude training s: ur: Material: , polyester The packaging Contains: 1x Mask