Punisher Men's and Women's 18-Vent Cycling Helmet with ABS Shell, Dial-Adjustable with Quick Release Neck Strap and Detachable Visor - Adult Size Large - One Size Fits Most Dual safety standard Certified bike and skate helmet meets ASTM f-1492 and cpsc-1203 safety standards. The helmet shell is a size large, use the dial and interior pads to adjust to a large or a medium. 18-Vent air cooling vents ABS protective shell Gray EPS impact absorption liner. Includes detachable front visor Quick release buckle strap adjustment for fast and easy chin strap fitting. Aculock dial-adjust fit in rear Heavy duty nylon straps & heat sealed foam pads to allow helmet to fit as an adult medium or large ABS shell with high Luster paint & UV sticker that will Not fade in sunlight. High quality bike helmet Specs