Thousand Heritage Helmet: Designed for urban cycling and skating, the minimalist Heritage bike helmets are Thousand's original collection, inspired by the simplicity of vintage moto lids and the heritage color ways of the 50s and 60s. Dual-certified for cycling & skateboarding for North America: CPSC, ASTM F1492 Secret PopLock for securing your bike helmet with your lock Vegan leather straps Integrated dial fit system for precise adjustments One-handed magnetic fastener A built-in low-profile visor Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older Certified for CPSC and ASTM standards for cycling, roller skating, and skateboarding Lightweight helmet at 410g (S), 460g (M) or 490g (L) S - 21 ¼ - 22 ?, M - 22 ? - 23 ¼, L - 23 ¼ - 24 ? inches