DBIO Snowboard helmet provides superior protection during skiing and snowboarding activities with a reinforced ABS shell, shock-absorbing EPS core, and is certified and approved to meet ASTM F2040 safety standards for reliable safety. Equipped with 9 vents that help keep your goggles clean and fog-free while also ensuring that you maintain a comfortable temperature every time you ski. To adjust the size of this snow helmet, simply turn the size adjustment dial. It's available in small (18.9-20 inches). To ensure a comfortable fit, measure the circumference of your head by wrapping the tape measure around the widest part of your head, keeping it level at the front and back and above your ears. This will give you the correct size for a snug and comfortable fit. This Item Is New And Comes As Pictured. Please Refer To The SIZE CHART Picture Listed To Determine The Correct Size. Please Ask Any Questions Prior To Purchase As All Sales Are Final.