Features1Rearmounted taillights for more peace of mind when riding at night, the tail is builtin warning taillights, high brightness, USB charging, 9 LED light modes, switching between different scenes. 2An integral brim blocks sunlight and avoids dazzling. Sports carstyle integrated rear wing dynamic design to reduce wind resistance. 317pcs air vents for lasting refreshing and breathable, reduce sultry. 4There are reflective strips to reduce the friction between the face and ears, and the reflective material will highlight the light when riding at night. 5The entire 3D detachable inner lining keeps the contact distance between the head and the helmet, and makes the head more comfortable after wearing.SpecificationItem Type: Bike HelmetMaterial: PC+EPSColor: As Pictures Shown Weight: Approx. 623g/22ozHead circumference: 57-62cm/22.4-24.4inHole number: 17pcsBuilt-in lithium battery 220mAhPackage List1 xBike Helmet1 x USB Cable1 x Manual