The rockbros bike helmet features a smart, color-changing visor that adjusts to changing light conditions, allowing you to look cool and stylish on every ride no squinting or glasses required designed for road cyclists and mountain adventurers, this helmet fits cyclists with heads measuring 55-61 cm. The integrated usb-rechargeable taillight keeps you visible and safe, whether on city streets or forest trails. Lightweight, fun, and ready for use, it's the perfect companion for men and women who value safety and style features warning tail light the rockbros helmet is equipped with tail light to ensure the safety of the rider during the ride. It protects night riders and effectively avoids most safety hazards on the road. The tail light provides three flashing modes, which can be adjusted according to different situations. Uv400 photochromic lenses the rockbros photochromic lenses become brighter or darker depending on the effect of ultraviolet rays. The lenses can protect your eyes from uva, uvb and uvc radiation during cycling sun visor for face protection the helmet is equipped with a sun visor that offers additional protection for the rider's face. It shields against mud, branches, and debris, preventing them from hitting the rider's eyes and face. Thickened liner and insect net the interior of the helmet has a thicker liner that enhances sweat absorption, breathability, and shock absorption. The liner can be easily removed for cleaning thanks to a hook-and-loop design...