Flybar Bicycle Helmet: Multi Sport Dual Certified Adjustable, Adults Helmets. Different colors and designs: Whether you want a cool printed design or a simple solid matte color, every helmet offers the same trustworthy protection to keep both kids and adults safe during multi-sports activities. 12 wide stylish vents on each Flybar Helmet provide even air flow to keep cool during active sports sessions Available in 3 sizes S/M (53-55cm/20.8-21.6in); M/L (55-58cm/21.6-22.8in); L/XL (58-61cm/22.8-24in). For a perfect fit, measure the circumference of your head starting in the middle of your forehead to ensure you choose the correct size Adjustable fit: The Flybar Helmets feature an adjustable spin dial on the back of the helmet to ensure a perfect and safe fit Strong ABS outer shell and EPS foam inner lining: Made of high-quality ABS shell, high-density EPS foam inner shell, the Flybar Helmet protects you from potentially harmful impact while engaging in sports. Whether you want to use it as a BMX helmet, skate helmet, hockey helmet, scooter helmet, or a bike helmets for men or women MULTI-SPORT: Flybar helmets for adults and teens are adaptable for multi-indoor and outdoor activities including Inline and rollerblade skating, BMX, bike, Pogo, skateboarding and scooter DURABLE: Made of high-quality ABS shell, high-density EPS foam inner shell with 1-inch thick shock-absorbing foam SIZE CHART: For a perfect fit, measure the circumference of your head. S/M (53-55cm/20.8-21.6in); M/L (55-58cm/21.6-22.8in); L/XL (58-61cm/22.8-24in) Features an adjustable spin dial to ensure a safe and snug fit DESIGNED FOR MAXIMUM COMFORT: With a special aerodynamic design, 12 vents circulate air, keeping your head cool and reducing sweating MACHINE WASHABLE: Removable pads are washable and quick-drying. Easy to wash the sweat away