CoolMax® is a Dacron Polyester fiber that is renown in the world of athletics for its moisture management, wicking and drying capabilities. This special four~channel fiber has a unique structure that provides 20% more surface area than ordinary fibers. The result is that moisture is transported quickly, speeding the evaporation process and drying 70% faster than cotton. When knit into a sock with the correct weight, breathability and technical features, users enjoy the benehts of cool, dry feet, comfort and performance. CoolMax® is a registered trademark of DuPont.