Favoto Mountain Bike Helmet Adult- Dual Shell Lightweight Mtb Bicycle Helmet Dual Shell Protection: CE (European Standard) and CPSC (US National Standard) approved. The PC dual-shell integrated molding design enhances durability and provides superior impact protection. The high-density 20mm EPS foam effectively absorbs and disperses impact forces, ensuring reliable protection. Comfortable and Lightweight Design: Featuring a rear elastic cord for easy hanging and quick removal of sports glasses. The high-quality moisture-wicking liner is lightweight, breathable, and can be easily removed and cleaned, ensuring a clean and cool riding experience. The bike helmet weighs only 335g/0.74 pounds, reducing neck pressure even during extended wear. Sun Visor for Protection: Reinforced large sun visor is carefully designed to provide eye and impact protection, preventing mud, branches, or other debris from directly hitting the rider's eyes and forehead during cycling. The high-quality metal buckle ensures secure fastening without the need for tools. Adjustable and Secure Fit: Size M 54-58cm/21.2-22.8inch (allow about 1cm difference, measure your head before purchasing). One-handed adjustable dial knob and internal padding ensure a perfect fit. Versatile Cycling Helmet: Specifically designed for various road and mountain biking activities, especially endurance and off-road riding. With the removable visor, it is suitable for commuting bikes in urban and suburban areas.