Bell 2017 Stoker MIPS All-Mountain Bike Helmet Construction: Fusion In-Mold Polycarbonate Shell Certifications: CE EN1078, CPSC Bicycle Vents: 13 vents, 4 brow ports Sizes: S 52-56cm, M 55-59cm, L 58-62cm, XL 61-65cm (select colors) Weight: 351g (0.774lbs)