Features:Lightweight Integrally-molded helmet， made of EPS & PC， high density， durable and comfortable.21 vents bring cool air in and flush warm air out， well-ventilated.Built-in LED taillight with three light modes: constant mode and slow / quick flashing mode.With removable， protective， sweat absorption lining pad， fly net and visor， comfortable to wear and easy to wash.Adjustable strap， head circumference: 54~64cm， head width: 18cm.Stay safe while cycling with the bike helmet， perfect for on-road and off-road use.Specifications:Color: Blue/RedAge group: AdultVent qty: 21 ventsMaterial: EPS & PCHead width: 18cm / 7.1inHead circumference: 54~64cm / 21.2~25.2inItem size: Approx. 27 * 20.5 * 12cm / 10.6 * 8.1 * 4.7inTotal weight: 230g / 8ozPackage List:1 * Bike Helmet1 * Visor