1、Ventilation 11 hole design, accelerated air circulation to exhaust hot air. 2、ABS high-strength anti-collision material, antidrop, cushioning and shock absorption. 3、360 degree rotating headcircumference adjuster, which can adjust the appropriate size according to different headcircumference. 4、Internal EPS high-density anti-collision foam, efficient cushioning and shock absorption. 5、Ski mirror elastic band fixing bracket, which can fix different widths of ski mirror elastic bands. 6、Equipped with ear protectors and chin pads for warmth and comfort, preventing skin abrasion. 7、Quick and convenient buckle insertion, can be quickly removed and worn, without blocking, making it more convenient to use. This product is made of fine quality material and reinforced ABS sheet, with strong impact resistance, aging resistance, not easy to scratch. Features: Ventilation 11 hole design, accelerated air circulation to exhaust hot air. ABS high-strength anti-collision material, antidrop, cushioning and shock absorption. 360 degree rotating headcircumference adjuster, which can adjust the appropriate size according to different headcircumference. Internal EPS high-density anti-collision foam, efficient cushioning and shock absorption. Ski mirror elastic band fixing bracket, which can fix different widths of ski mirror elastic bands. Equipped with ear protectors and chin pads for warmth and comfort, preventing skin abrasion. Quick and convenient buckle insertion, can be quickly removed and worn, without blocking, making it more convenient to use. Specifications: Color: black, white (optional) Size: M, L  (optional) Material: ABS+EPS Heads circumference: M: 550-580mm adjustable M: 590-610mm adjustable Item size: 280 * 170mm / 11.0 * 6.7in Package size: 300 * 250 * 200mm / 11.8 * 9.8 * 7.9in Package weight: 600g / 1.3lb Packing List: 1 * Cycle Helmets 1 * Cycle Helmets