PHZ Bike Helmet with Led Light on the back(More Comfortable and Safety for your bicycle experience! Rechargeable Taillight- More Specifications: Material: Tough PC shell, EPS foam and Detachable inner sponge: M: weight: 0. 55lb, Head Size : (21. 5-22. 4 in) L: weight: 0. 63lb , Head Size: (22. 8-23. 6 in) Air vents holes: 23, keep rider's head cool and dry With any bike: city, road, electric, trek, triathlon or mountain bike and etc Rechargeable Taillight- More : This cycling helmet equip with 3 lighting modes Led Rechargeable taillight for the safety of riding at night - Always On, Fast Flash, Slow Flash will help people behind you clearly recognized your direction. In the case of full power, about 3 hours- 4hours can be used It takes about 40 minute to fully charge, when charging, it will be red, full is green light Detachable Inner Sponge: The inner sponge lining can unpick to wash and it is comfortable and breathable. Removable Visor for Convenience: The special design of visor provides shade when biking, so that you can enjoy cycling even in hot days, and you can take off the visor blocks when you don't want it. Adjustable: These bike helmets come with an adjustable strap , side buckle and rotary regulator which make it flexible to fit the size of unisex Adults. Turn right to tighten, left to loosen. Make sure the helmet fits snugly on your head Package Include: Bike helmet x1 Rechargeable taillight x1 Charging Cable x1 User Manual x1