1、PC material, integrated molding, enhances the structural strength of the helmet, resists impact, and ensures safer riding. 2、28 VentilationHoles design with multiple large holes, allowing for breathability and avoiding stuffiness during Cycle. 3、The helmet is made of thickened EPS foam material, which can effectively absorb impactforce and minimize the risk of injury to the heads during impact. 4、The riding helmet is made of lightweight materials and is lined with breathable material for comfort. 5、Detachable lining for easy cleaning and more comfortable wearing. 6、There is an adjustment knob on the back of the bike helmet to help adjust the heads circumference. 7、Thickened detachable chinpad design reduces discomfort and prevents chinpain. This product is made of fine quality environmental protections material and reinforced EPS sheet, with strong impact resistance, aging resistance, not easy to scratch. Features: PC material, integrated molding, enhances the structural strength of the helmet, resists impact, and ensures safer riding. 28 VentilationHoles design with multiple large holes, allowing for breathability and avoiding stuffiness during Cycle. The helmet is made of thickened EPS foam material, which can effectively absorb impactforce and minimize the risk of injury to the heads during impact. The riding helmet is made of lightweight materials and is lined with breathable material for comfort. Detachable lining for easy cleaning and more comfortable wearing. There is an adjustment knob on the back of the bike helmet to help adjust the heads circumference. Thickened detachable chinpad design reduces discomfort and prevents chinpain. Specifications: Color: orange, black, grey, blue, purple (optional) Material: PC+EPS Heads circumference: 540-620mm Item size: 280 * 185 * 230mm / 11.0 * 7.3 * 9.0in Item weight: 243g / 8.6ounce Package size: 280 * 240 * 170mm / 11.0 * 9.4 * 6.7in Package weight: 432g / 1.0lb Packing List: 1 * Bike Helmet 1 * Bike Helmet