Features: Fits Head circumference Size: S :52-55cm,M : 56-60cm ,L:61-64cm Design to help reduce the risk injury Comfortable and Easy to wear Designed for All Types of Skating, Skateboarding and Cycling.Extended Rear Coverage to Protect Against Backward Falls. 11 Vents Designed to Force Cool Air In and Warm Air Out. Strong Protective ABS Outer Shell. Lightweight, Energy Absorbing EPS Lining Includes Extra Interior Pads for Custom Fitting. Fully Adjustable Quick-Release Chin-StrapConforms Adjustable Safety Standard EN1078. Warranty Please do not hesitate to contact us if you are not satisfied for any reason. Our products are backed by 18 months Warranty.