KUYOU Helmet ABS Shell for Skateboard/Ski /Skating/Roller Protective Gear Suitable Kids and Youth,Adult 3 Size. CE EN1078 Certified /CPSC Standards (This is the current european safety/manufacturing standard for helmets. The toughest testing requirements for helmets are currently imposed by CE-tests, including impact damping capabilities, effectiveness of the strap system as well as range of vision.) Light weight ABS shell & black EPS lining sponge fabric,Soft Inner pads for extra comfort. Fits Head circumference Size: S :45-51cm/ 17.7" - 20.1" ; M : 49-55cm / 19.3"-21.7" ;L:52-58cm / 20.5"-22.8",Please According to head circumference, choose your size. Adjustable straps and spin dial (which is removable): The skateboarding helmets equipped with adjustable straps and and spin dial for Adult /kids to adjust flexibly to get a better fit. It is good partner for pedal cycling ,skating,Hip-Hop,skateboard,BMX,Dry slop ,Skiing ,Roller,skateboarding Skateboarding Protective?and more outdoor sports.