Skateboard Helmet,Bike Helmets For Adults - Commuter, Bike, Skate, Scooter, PREMIUM PROTECTION-Our bike helmet is features fully formed ABS shell and thicken EPS core to absorb shock and ensure safety while you riding bike, skateboarding, scooters and inline skating. DETACHABLE EASY CLEAN LINER-The bike helmet equiped with elastic mesh lining which helps to fits head well and more comfortable. It can be easily take down and easy to wash the sweat away. SKATEBOARD HELMET FOR TEENAGERS-A unisex boy's and girl's skateboard helmet is great for most outdoor sports, such as ice skating, roller skating, scooter riding, longboard, road bike. Ideal for casual cycling and skateboarding. ADJUSTABLE VENTILATION-The chin strap and scalloped buckle can be tightened or loosened to adjust size, with the rotating back dial system help you fit snugger. Skate helmet with 10 vents to reduce resistance and breathable, always keep cool and comfortable every ride. GET THE PERFECT FIT-Slightly wrap a measuring tape around your head, keeping above ears and 1"above eyebrows, then ensure the max size of your head circumference. Size Medium 21.6-22.8 inches(55-58cm) is suggested for young boys, young girls and small head circumference women men.