Parameter Weight, Sizes & Colors Weightabout 360g Size: S/M(54-61cm) 2 ranging colors Construction Outer Shell Construction: In-mold polycarbonate shell with EPS liner Inner Shell: Thermoformed reinforcement shock absorbing polystyrene Fit System Lightweight fit system with an easy-to-turn dial for adjustments 4 Wind Tunnel vents with internal channeling Comfort Super fit designed for the purpose of asian and western head shape. Clean Tex Pads are treated antibacterially and therefore prevent the rise of bacteria within the helmet. As a consequence, longevity and long-lasting hygienic freshness is achieved. Chinpad Optimal wearing comfort in the chin area. Safety Complies with CE EN 1078 safety standards for helmet for cycling and use with skateboards and roller skates for persons age 5 and older. AccessoriesMagnetic goggles Features It has the good ventilate function with air holes,and good protective performance cause it was specially designed for the endurance racing athlete. The inner EPS shock-release system was put in.and we used the aramid filament to enhance the strength.