AWE AeroLite Men's Bicycle Helmet - Black/Red, Size 58-61 CPSC Standards 16 CFR 1203 Safety Tested HELMET SIZE: 58-61cm. A Unisize Adjustment Headlock System At The Rear Of The Helmet Allows You To Make The Helmet The Perfect Fit Yourself` VENTILATION: There Are An Amazing 25 Air Vents for maximum cooling (Including 7 Rear). MATERIAL: Its In-Mould Construction fuses the Polycarbonate Outer Shell With The Helmets Absorbing EPS Foam Inner Core, giving an exceptionally Lightweight and Strong Helmet. Dual-density EPS liner. LIGHTWEIGHT: Incredible lightweight material = 265g Approx, Making This Hardly Noticeable Whilst Cycling DUEL SAFETY CERTIFIED: Conforms to Europen CE EN 1078:2012+A1:2012 and the much tougher USA helmet Safety regulations CPSC to ensure maximum safety!