Destroyer Certified Skateboard Helmet. CPSC ASTM Certified High Impact Multi-Sport Helmet: Cycling Skateboarding Scooter Roller Skate Inline Skating Rollerblading IMPACT RESISTANT - The DH 1 skateboard helmet is built with a durable and tough ABS shell. Inside is a soft liner which is designed to absorb external pressure caused by crashing or other impacts in various sport activities. Protection and comfort equals confidence and progression. VENTILATION - The DH 1 helmet is designed with multiple vents, and sweat absorbing foam liners. The foam is breathable and stable for use in a variety of different activities. ADJUSTABLE STRAPS FOR PERFECT FIT - The DH 1 skateboard helmet comes with adjustable straps that allow the user to adjust for a better fit. The lightweight design and durable materials are excellent for a number of different activities. MULTI SPORT USE - The unique design of the DH 1 Skateboard Helmet is idea for use in activities such as Skateboarding, BMX Biking, Roller Skating, Roller Blading, Longboarding, Scootering and many other activities. SIZING - (Circumference around users head) S/M: 53-57cm L/XL: 57-61cm