Adult Bicycle Helmet with Rechargeable USB Front & Back LED Light/Thick EPS Foam,Bike Helmet for Urban Commuter Men Women,Adjustable Lightweight Cycling Helmet BlackDurable and Adjustable SizeMade of impact resistance material. High density imported PC case with superior technology will surely improve safe performance. Bike helmet with durable hard shell, soft pad can absorb the pressure caused by external impact, it will protect your head in all directions. There is an adjusting knob at the back of the helmet, helping to adjust the head circumference. Built in Headlight and TaillightBike helmet has 3 white LED