The renowned Brainsaver rubber helmet is one of the best multi-impact helmets available. This helmet can be used as necessary protective gear for skateboarding, in-line skating ("rollerblading"), roller derby, and scooters. This helmet is not for bicycle use. At Triple Eight they know that sweating while skateboarding sucks, so the techies at Triple 8 listened to their top riders, went back to the drawing board and developed the patented Sweatsaver liner that helps eliminate the smells, the stinging and the eye blurring that occurs from sweat. Triple 8's revolutionary liner has moisture-wicking layers that limit sweat drippage, an anti-bacterial treatment to make it virtually stink proof, and a 360 degree wrap around design so that there is absolutely no liner separation. With Triple 8's terry cloth construction, you can kiss that itchy head feeling goodbye. The Sweatsaver liner is standard in all rubberized helmets and pro helmets, and is also sold individually in sizes XS - XL. Multi-impact Design Sweatsaver liner comes standard Adjustable Straps Triple Eight Customized Logo Rivets Ideal for skateboarding, in-line skating ("rollerblading"), roller derby, and scooters. Not for bicycle use. Sizes - XS, Small, Medium, Large, XL To ensure a perfect fit, measure the circumference of your head starting in the middle of your forehead and match it with the sizes below.