Made with our signature, patented material, IceFil technology. IceFil is a flat weave, anti-microbial, stretch fabric featuring a textured interior. It is ultra-soft and comfortable, and has been specifically engineered to: Dry quickly and wick away moisture with two-way circulation to control moisture and sweat Reduce thermal radiation and convert sweat to a cooling refrigerant Protect against UV rays and provide UPF 50 coverage