Features: standard snap lock, red flashing LED light (battery 1 x CR1632, 3V), optimal fit thanks to adjustable rotating ring, adjustable side clip keeps the webbing always in the optimal position, 8 ventilation openings for good air circulation, removable and washable fleece PE foam lining, stable and lightweight helmet construction thanks to Inmold technology. Certified according to EN1078 - CPSC standard. Size S: 48 to 53 cm head circumference. Size M: 52 to 56 cm head circumference. Material: Outside: 100% PC shell, Interior: 100% EPS, the lightweight high performance foam for maximum protection, Inner fabric: polyester fleece on PE foam padding.