Triple Eight Wristsaver wrist guards offer great support and protection with high density impact-resistant molded ABS splints on front and back of wrist for support. These wrist guards include shock absorbing EVA foam secured between support splints and wrist. A tough, 4-way stretch nylon mesh ensures a perfect fit. Triple Eight Wristsavers are ideal for inline skating (roller blading), roller derby and all roller sports.Wristsavers Sizing Guidelines:To ensure a perfect wrist guard fit, measure hand circumference at the knuckles and match to the sizes listed below:Jr 7.0 - 7.5 inches S 7.5 - 8.0 inchesM 8.0 - 9.0 inchesL 9.0 - 10.0 inches