Description: Durable PC(shell)/EPS(inner) and integrated molding technology absorb much impact energy to protect the head from crash. Reflective strips make it safer to ride at night. Designed with 18 air vents ensuring optimal air flow to make you feel cool while riding. Lightweight, comfortable and convenient to wear. Good head circumference adjustment system to fit all sizes. Removable lining with chin pad and insect proof net, soft and easy to clean. Specification: Material: PC(shell) + EPS(inner) Color: Black,Red, Titanium Size: Approx. 27 x 21 x 17cm/10.63 x 8.27 x 6.69inch Head circumference: Approx. 57-62cm/22.44-24.41inch Weight: Approx. 290g Package Includes: 1 Piece Helmet Note: The size may have some deviations due to manual measurement. And the photo color may differ a little due to different computer monitors or other factors. Thank you!