HEL020 Specifications: Material: Outside-PC. Inside-EPS. PU Foam. Nylon Adjust Belt Size:57~62cm adjustable Color:15 Coloes Net Weight:Approx 320g Vents:22 Air Holes Feature:With Goggles and Taillight Gender:Men Women aldult BRIGHT SAFETY LED BACKLIGHT Safe Red LED Backlight Powered by CR2030 replaceable battery 3 Modes: Linghting > slow flash > fast flash ADJUSTABLE SIZE FUNCTION The helmet features a Dual Fit adjustable design with an adjustment knob on the back to help adjust the head circumference. Adjustable size:57-62 cm Magnet Goggles COMFORTABLE VENTILATION DESIGN Based on aerodynamics, the bicycle helmet is designed with 22 vents to reduce air resistance and reduce sweating. All-ROUNDED & SUPER PROTECTION Adopted high quality EPS structure, the helmet could provide great performance in impact buffering and head protection. Internal Dimensions/Insect Netting Back Adjustment Gear Moldel: A03 Material: Outside-PC. Inside-EPS. PU Foam. Nylon Adjust Belt Size:58~62cm adjustable Color:Black / White / Gray Net Weight:Approx 326g Vents:11 Air Holes Feature:Taillight Design(Included The Battery) Gender:Men Women Package Included: 1 Cycling Helmet 1 USB Cable Szie Suitable for: 58~62 head circumference Bright Safety LED Back Light 9 Mode Safe Red LED Backlight - stable, slow flashing and fast flashing. It can warn other drivers behind you to understand your direction. All-Rounded & Super Portection Adopted high quality EPS structure, the helmet could provide great performance in impact buffering and head protection. Internal structure The inner lining fixed with Velcro can be removed and cleaned 11 Large Vents Comfortable Ventilation Design. Based on aerodynamics, the bicycle helmet is designed with 11 vents to reduce air resistance and reduce sweating. Adjust Buckle It can be adjusted to suit your size. Comfortable to wear