PC double-in-mold Sleek and aerodynamic design 15 air vents for maximum cooling Adjustable chin straps for added comfort JF-4 ring system A quick-release strap buckle Offers protection whilst being comfortable to wear Size: 54 to 58 and 58 to 61cm Available in variable colors Suitable for adults Customized designs are welcome CE-approved Safety tips: Wear helmet flat top your head, not tilted back at an angle Make sure helmet fits snugly and doesn't obstruct your field of vision Make sure chin strap fits securely and that buckle stays fastened Packing components: Inner packing: PE bag + color box + carton box or PE bag + head card + carton box 6 pieces/carton With sticker logo + instruction manual With visor