A breakthrough in personal cooling, the Hydroweave cap is one cool item.  By combining three-layer evaporative technology with a lightweight, flexible fabric, patented Hydroweave harnesses the power of evaporation to keep the wearer cool and comfortable in any climate or situation.  Simply wet the cap and enjoy its cooling effects for up to 8 hours at a time, depending on conditions.  It's machine washable and easily re-activated after each use.