The DeSoto Skin Cool Helmet Beanie is constructed of Skin Cooler Stretch Fabric. This fabric is designed to keep you cool on the hottest of days. This fabric is designed to keep you cool by dissipating the moisture of your sweat through channels to the outside of the fabric where a slight breeze will cool you down. The fabric will be wet but you will be cool. Skin Cooler fabrics also block 75% of UVB rays.