HIGH SAFTY PROTECTION — Built with a durable PC shell and high-density EPS foam, this Shinmax bike helmet helps absorb impact during rides. A reliable choice for adult cyclists commuting, road biking, or enjoying mountain trails. USB RECHARGEABLE REAR LIGHT — This adult bike helmet features a USB rechargeable rear light offers 9 lighting modes, including steady and flashing settings, and a reflective sticker is attached to the back to help improve visibility during daily rides, commuting, road cycling, and evening bike trips. Fully charges in about 2 hours and includes a USB charging cable for everyday convenience. DETACHABLE MAGNETIC GOGGLES — The magnetic visor attaches and removes easily for flexible use in different cycling conditions, this bicycle helmet helps shield your eyes from sun, wind, and dust while riding, UV 400.Wear it up, down, or remove it completely. ADJUSTABLE ADULT BIKE HELMET — The bicycle helmet for adults Designed with an adjustable rear dial and side straps to ensure a secure, personalized fit for both adult men and women. M fits 21.26–22.83 in / 54–58 cm. ; L fits 22.44–24.41 in / 57–62 cm. Please measure your head before purchase for best fit. LIGHTWEIGHT & VENTILATED CYCLING HELMET— This adult bicycle helmet is designed for comfort on longer rides. 27 air vents help increase airflow, while removable inner pads make cleaning simple after daily commuting or cycling.