Breathable Cycle Helmet Bicycle Helmet Ultralight Integrated Bike Helmet Safety Cap Cycle Equipment This product is made of fine quality environmental protections material and reinforced plastics sheet, with strong impact resistance, aging resistance, not easy to scratch. Features: There is an adjustment knob on the back of the bike helmet to help adjust the heads circumference. The helmet is made of thickened multi-density EPS foam material, which can effectively absorb impact energy and minimize the risk of injury to the heads during impact. Detachable soft lining and chinpad, comfortable to wear and convenient to wash. The riding helmet is made of lightweight materials and is lined with breathable material for comfort. Using a professional aerodynamic and ventilation design, the air passes through the bike helmet to help increase speed and keep you cool. Specifications: Color: white, black (optional) Material: PC+EPS Heads circumference: 540-620mm Item size: 280 * 210 * 140mm / 11.0 * 8.3 * 5.5in Item weight: 243g / 8.6ounce Package size: 280 * 225 * 170mm / 11.0 * 8.9 * 6.7in Package weight: 432g / 1.0lb Packing List: 1 * Helmet