1.Lightweight & Comfortable - Upgraded lightweight ABS shell with a thick, high density fully vented EPS liner, ventilation opening system for air intake and exhaust, which brings you a better protection and comfortable wearing during riding. 2.Advanced Lightweight Durable ABS Shell with EPS Impact Absorption. Fully Removable Interior, Integrated Sun Visor, Quick Release Fastening DOT Approved. Meets the FMVSS 218 Standard. 3.Standards to ensure quality and safety, sharp looking design makes you stand out from the crowd, ideal for dirt bike, motocross, ATV etc. Size for the helmet: S | 20.5 - 20.9 in | 52 - 53 cm Kids M | 21.0 - 21.7 in | 54 - 55 cm Youth L | 22.0 - 22.5 in | 56 - 57 cm XL | 23.2 - 23.6 in | 59 - 61 cm.