Space cotton using reflection function of metal coating, the heat coming from the human body by reflected back to the human body, resulting in a high efficiency heat preservation effect, and the human body is sending out the sweat pores of gas can be through the metal layer and nonwovens from pores, make the person won't feel quite stuffy, in use as long as the metal bright face hot objects, can achieve satisfactory results.Compared with cotton, space cotton can be reduced to less than a quarter by weight with the same insulation effect.