<ul><li>M SIZE BIKE HELMET:21.6-22.83INCH(55-58CM) - Suggest for youth age 14+ years old,boys and girls</li><li>L SIZE BIKE HELMET:22.83-24INCH(58-61CM) - Suggest for adult, men and women</li><li>ADULT BIKE HELMET - Built for urban riders and commuters,perfect fit for men and women</li><li>DUAL CERTIFIED - GCC certified & CE certified,meet US & EU safety standards special for Urban bike,Road Bike,Bicycle,Cycling</li><li>DETACHABLE SAFETY REAR LIGHT - Rechargeable USB rear light. Fully charged in 2 hours,2 models light last for about 3-5 hours</li><li>LIGHTWEIGHT&BREATHABLE - PC shell and high-density EPS foam in-mold construction is durable and light.15 cooling vents will keep you comfortable while riding</li></ul><br><br>

Bike Helmet Adult Urban:Bicycle Helmet for Men Women with USB Charge Detachable Taillight Helmets for Commuter Cycling Scooters