Under-helmet liner made from Coolmax®, an extremely breathable material that wicks moisture to the outside, leaving the skin dry at all times. Soft & versatile, the garment is designed to dry quickly. Features Coolmax® under-helmet liner Breathable, soft & lightweight Coolmax® Coolmax® is a specially developed polyester fabric manufactured exclusively by Invista, an American textile company. This polyester fabric is made from fibers that have been carefully engineered to wick away moisture & allow heat to pass through.