FEATURES: Built for comfort and durability while going up and down hills on open gravel roads A relaxed, modern look complete with mini front visor Extra rear coverage to maintain industry standard protection 23 separate air vents for cool relief on long rides One-handed adjustment for easy fitting Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older TECHNOLOGY: MIPS (Multi-Directional Impact Protection System) equipped and extra rear coverage for increased protection SPECS: S/M: 54-58 cm in circumference L/XL: 58-61 cm in circumference