Weight: 270g Uniform code, suitable for head circumference (57-61 cm), head width 20 cm or so, head length 24 CM Configuration: PC colour plastic suction shell and black EPS foam combined forming, internal equiped with  back lights Unique and beautiful in shape design, fashionable in style, reasonable in hole position design, comfortable in ventilation and easy to wear. Wind Tunnel and Wind Channel Design, Effective Reduction of Wind Direction Resistance Highway Mountainous Dual Helmets, EPS, Upper and Lower Shells Integrated Forming