New Bike Helmet Anti-collision Sport Cycling Helmet with Taillight Portable Lightweight Ultralight Adjustable Adult Helmet Feature: 1. Design: The helmet shape is scientific and reasonable, the ventilation hole is designed, the top hydraulic form vent and the tail straight exhaust vent make you ride more relaxed and happy, the wind breaking and low wind resistance make you happy step by step, and the ultra-light~body molding reduces pressure and load. The tail light at the rear of the helmet can be turned on to remind the vehicles and pedestrians in the rear to pay attention to avoid riding danger when riding at night. 2. HD lens: HD lens, anti-crack, anti-drop and not easy to deform, the windshield can be reversed, fashionable and refreshing, sunshade, sunscreen, windproof, protect the eyes, and do not affect the glasses. 3. Ventilation and breathability: ventilation and breathability, multi-layer material protection, and EPS buffer layer elastic material in the inner layer, which can effectively protect the head, and can be removed and washed. 4. Construction: flexible nylon windproof strap, windshield, removable and thickened chin pad, convenient buckle, large lining coverage area, removable and clean lining, comfortable to wear and better protection. 5. Helmet tail rotating adjustment system: the helmet tail rotating adjustment system, with a fine adjustment knob, can adjust the size of the head circumference, adjust the tightness of the comfortable fit head, accurately fit the head shape and wear comfortable, simple and easy to use, bringing you a simple, stable and accurate fit experience. Specification: Age Group: (Adults) Men/Women Product name: riding helmet Main material: PC+EPS Product color: Yellow, Blue, Black White, White Black, Black Blue, Black Green, Black Red(optional) Product Size: 28*22*14cm head circumference：52-62cm Adjustable, Applicable scene: mountain bike, motorcycle, etc. Model Number: Cycling Helmet Package: 1 Pcs Helmet Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.