Zefal Ultra Light Adult Bike Helmet - One of the lightest weight helmets in this style. Includes built-in rear-facing red LED lights for high visibility. Stay comfortable with universal Sure-Fit Padding. The in-mold construction bonds the outer shell to the inner foam core resulting in a higher quality construction and premium finish. Easily switches modes from constant/flashing/off. Long lasting lithium battery is easily replaced. Light up the night! Light weight. Lights up. Light modes- constant/flashing/off Long lasting lithium battery Battery easily replaced (1x CR2032) CPSC approved Universal Sure-Fit Padding Built-in rear-facing red LED light (12 LEDs) Adjustable straps Greater visibility in the day and dusk For adults (ages 14+) Size 58-61 cm 12 Vents