Features: CE and SGS-approved helmet for adults PC double-in-mold Sleek and aerodynamic design 24 air vents for maximum cooling Adjustable chin straps for added comfort JF-four ring system Total weight: 230g A quick-release strap buckle It offers protection while being comfortable Available in 58 to 61cm Available in variable colors Customized designs are welcome Helmet safety tips: Wear the helmet flat on top of your head and not tilted back at an angle Make sure the helmet fits snugly and it doesn't obstruct your field of vision Make sure the chin strap fits securely and that the buckle stays fastened Packing components: Inner packing: PE bag with color box with carton box or PE bag with head card with carton box Sticker logo with instruction manual With visor Packing style: 6, 8, 10, or 12 pieces/carton