This helmet seeks a lightweight construction, ample ventilation, comfort personnel wearing and less resistance that make it one of the kind perfect for cycling, skating, skateboarding! Offering an in-mold PC shell and EPS liner integration for amazing impact protection, with the fit adjustment wheel, Y-shape adjustable strap and breathable soft chin guard , the helmet securely stays on your head. Features: Impact-resistant polycarbonate shell with EPS foam absorbs shock. Detachable sun visor provides shade for your eyes. 18 vents keep your head cool and reduce wind friction. Adjustable dial fits 22.0" - 24.0" head circumference. Super light, weighs about 200 grams each. Specifications: Material: PC + EPS Color: 1# / 3# / 7# / 9# / 11# (optional) Vents: 18 Head Circumference: 56 - 61cm / 22.0 - 24.0in Weight: 200g / 7.0oz Package List: 1 * Helmet