If you sweat like we do when you ride, you"re going to need the Headsweats Classic cap. It"s a skull cap that fits under a cycling helmet with the classic style favored by Il Pirata. The CoolMax fabric helps wick away moisture and lets some air over your scalp. CoolMax fabric shell helps wick away moisture and let lots of air in CoolMax terry sweatband keeps the salty stuff from running into your eyes Eventure elastic for a great fit Easily fits under most helmets Machine washable