Gonex Bike Helmet, Bicyle Adult Helmet(Boston Green ) Color:Boston Green Material:Housing:high quality 0.8mm PC + Matt printing;Inner casing:85EPS (high-density foaming / imported materials) integrally molded Size:about 30 x 22x 15cm;Weight:270g Head circumference:about 57-62cm adjustable Features:streamlined design, anti-windage, Soft washable pads, strong, 19-hole breathable big holes, comfortable lining, with regulator