Features: innovative magnetic Fidlock fastener red flashing LED light (battery 1 x CR1632, 3V) optimum fit thanks to adjustable swivel ring the adjustable side clip always keeps the strap in the optimum position 8 ventilation openings for good air circulation removable and washable inner lining made from fleece PE foam stable and lightweight helmet construction thanks to inmould technology certified according to EN1078 | CPSC standard Sizes: Size XS: 46 to 50 cm head circumference Size S: 48 to 53 cm head circumference Size M: 52 to 56 cm head circumference Material: Outer: 100% PC shell Inside: 100% EPS, the lightweight high-performance foam for maximum protection Inner fabric: Polyester fleece on PE foam padding