Features: brand new and high quality Durable built-in molding, ventilation, detachable lining,for head circumference is adjustable. The inner forehead lining absorbs sweat to keep wear comfortable. It's easy to remove and wash. The helmet can be washed with water without dead corners to absorb sweat and avoid odors. The back of the helmet is equipped with a removable usb charging tail lamp, which has high brightness and provides 9 warning modes. It is safe and reliable to walk at night. Buffer eps layer in for case of strong impact, will disperse impact force for the first for time, relieve shock, keep for head from secondary injuries. The material is widely used in high-speed rail and automotive for protection devices. The tail lamp is easy to remove and does not require a helmet for daily charging. There is a fixed buckle on the back of the tail lamp, which can be used independently. It is simple to hang backpacks, clothes, etc. Specifications: Tape: Wear Resistant Reflective Tape Color:Blue Purple for Titanium Black White Application: Electric Vehicle, Motorcycle, Bicycle Integrated Three-layer Protective Molding： PC Outer Layer,medium EPS Foam,cushion Inner Layer. Package Includes: 1 x Bicycle Helmet. note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!