Shinobu Sports INVISTA COOLMAX Quick Drying Hat & Helmet Skull Cap (2-IN-A-SET) BLACK SR-007 High quality material COOLMAX that is widely used in sport wears as it quickly absorbs and drys sweat. It helps eliminate the steam and stickiness of sweat, reduce an odor and keeps the helmet clean longer. Great for a longer driving/biking as well as daily use, as it quickly dries. Quick dry helps reduce the fogging of helmets and goggles. Comes with 2 units. Not necessary to wash every day even in the summer.