CoolMax is the brand name of a series of high-performance fabrics designed and marketed mainly for sportswear that are designed to wick moisture away from the skin. CoolMax was created using four channel polyester fibers that are woven together in cross sections to allow air to flow through the fabric. The fabrics employ specially-engineered polyester fibers to improve “breathability” compared to natural fibers like cotton. It’s a lightweight, durable fabric that is temperature regulating and keeps the skin dry and warm.