SMITH MAINLINE MIPS HELMETREADY TO DESCENDWhen it comes to aggressive mountain biking, you'll want aggressive protection. Nothing protects your head better while riding downhill than a full-face helmet. The Smith Mainline MIPS Helmet is designed for those who like to send it. It is an ultra-light full-face helmet that features MIPS to help reduce injuries caused by rotational impacts. It also features Koroyd crumple zones that further enhance your protection. Features21 vents with exhaust channeling help keep the air flowing during those warmer rides MIPS helps mitigate harmful rotational impacts Includes additional paddingto find the ideal fit Goggle strap compatibleto keep goggles secured in place Koroyd protection zones further enhance your coverage SPECIFICATIONSCore Material EPS + Koroyd Closure system D-Ring fastener Safety Certifications ASTM F1952 Downhill-Certified Intended Use DH, Park, Enduro Weight-Sizing Size Small Medium Large Extra Large Head Circumference (in)20 - 22"22 - 23"23 - 25"24 - 25. 6"Head Circumference (cm)51 - 55cm55 - 59cm59 - 62cm61 - 65cm | Smith | Mainline Mips Helmet Men's | Size Small In White