Helmet & Riding Gear Sizing (General)

Helmet size chart by age infographic: median head circumference for boys and girls at ages 1 to 5 (46.1/44.9 cm to 50.7/49.9 cm), CPSC label to look for, and how to measure

Helmet Size Chart by Age 2026: Complete Fit Guide

Typical head sizes by age from WHO, kids' helmet sizes from Giro, Bell, woom, Bobike and Fox, the CPSC Age 1 vs Age 5 labels, and the NHTSA fit check.