Shinobu Riders INVISTA COOLMAX Quick Drying Helmet Skull Cap (4-IN-A-SET) BLACK SR-002 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. Helps retain your hairstyle while wearing a helmet. Great for a longer driving/biking as well as daily use, as it quickly dries. Comes with 4 units. Not necessary to wash every day even in the summer.