Description:Principle: the 35 degree constant temperature socks are made of cotton and polypropylene. The outer layer is pure cotton and the inner layer is health fiber. Adding elastic fiber can give full play to the health care function of health fiber and increase the moisture permeability and air permeability of socks. Under the stimulation of the environment temperature and human body temperature, it can produce energy which is easy to be absorbed by human body. It can enhance the vitality of human cells, promote metabolism, effectively improve microcirculation of human body and inhibit bacterial reproductionGreat for outdoor activitiesskiing, snowboarding, hiking, hockey, and other sports.Specifications:Fabric Name: aluminum plated fiberApplicable gender: Male / femaleColor: (black) longSize: one size fits allPackage Included:A pair of stockings