Face mask with breathing valve

摘要

Problem to be solved: to provide a good air permeability mask capable of coping with hot summer.An air valve is attached to the mask so that the expiration smoothly flows out. By this, the exhalation including heat, moisture and carbon dioxide can not be stored in the mask, and the risk of heat stroke can be reduced. In addition, it is useful not only to direct the outside air but also to the prevention surface.Diagram