Triple Eight 3036 Dual Certified Helmet, X-Small/Small, All Black Rubber Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons and Older AND ASTM F-1492-08 Safety Standards Complies with CE EN 1078 - Helmets for pedal cyclists, skateboarders, & roller skaters. Complies with AS/NZS 2063 - Bicycle Helmets. XS/S 18.9  21.3 in (48  54 cm) S/M 21.7  22.8 in (55  58 cm) L/XL 23.2  24 in (59  61 cm) Ideal for biking, skateboarding, long boarding, inline skating (roller blading), and roller skating Triple Eight Customized Logo Rivets Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older AND ASTM F-1492-08 Safety Standards for skateboarding Complies with CE EN 1078 - Helmets for pedal cyclists, skateboarders, & roller skaters Complies with AS/NZS 2063 - Bicycle Helmets Ideal for biking, skateboarding, long boarding, inline skating (roller blading) and roller skating Triple Eight Customized Logo Rivets