Featrues 1. Fit for Adults: Measure the size of the wearer's head before buying. The adjustable size of this adult bike helmet ranges 52cm to 62cm. There is a adjusting knob at the back of this lightweight bike helmet to fit various head circumferences. 2. With LED Tail Light: 3 lighting modes( always on, slow flashing, fast flashing) is safer during night cycling. 2 button batteries are included. 3. High Quality Material: Integrally- molded EPS lining allround cycling helmets with durable PC shell to provide effective shock- absorbing protection. Lightweight featured This LED rear light bike helmet at 250g. 4. Breathable& Comfortable: With 18 quick- ventilating air holes to keep your head cool during sports. Inner padding is washable and easy to remove for convenient use. 5. With Removable Visor: The design of visor provides shade for biking, so that you can enjoy cycling even in hot days. You can also take off the visor blocks when you don't want it. Please be careful to prevent scratching your skin during the brim installation and uninstallation. Specification Material: EPS+PC Color: Blue Black Size: Head Circumference 52-62cm Package Include: 1 Bicycle Helmet