Features1Integrated in-mold PC shell with EPS impact foam. Extended helmet brim to block sunshine. 2Fit adjustment back wheel for comfort wearing. 3Removable inner padding to absorb shock and sweat. 4Breathable chin guard and head protective padding. 518 vents seek for ample ventilation.SpecificationOffering an in-mold construction that integrates a PC shell with an EPS liner for amazing impact conservation, this helmet seek a lightweight quality, ample ventilation, comfort wearing and sleek style that make this helmet one of the kind you never want to miss! The fit adjustment wheel and strap that guards your chin ensure the helmet securely stays on your head and survive from bushes.Features:Integrated in-mold PC shell with EPS impact foam.Extended helmet brim to block sunshine.Fit adjustment back wheel for comfort wearing.18 vents seek for ample ventilation.Removable inner padding to absorb shock and sweat.Breathable chin guard and head protective padding. Specifications:Material: EPS & PCColor: Black / Red / Blue / White (Optional)Head circumference: 57-60cm / 22.4-23.6in (L)Vents: 18Density: 85g/LItem size: 29 * 21.5 * 14cm / 11.4 * 8.5 * 5.5inItem weight: 261g / 9.2ozPackage size: 29 * 23 * 17cm / 11.4 * 9.1 * 6.7inPackage weight: 479g / 16.8ozPackage List:1 * Bicycle Helmet1 * User Manual (English)NOTE: Please allow 1-2cm slight measuring deviation due to manual measurement.Package List1 * Bicycle Helmet1 * User Manual (English)NOTE: Please allow 1-2cm slight measuring deviation due to manual measurement.