IRH All Terrain Rider Helmet The latest innovation in all-around riding helmets. Sporty, low-profile, ultra lightweight helmet is perfect for long trail rides, riding rings or anywhere else you ride. Twelve vent ports, a sun-blocking visor and Dial Fit System ensure your comfort. Durable Ultra Suede covering will keep you and your helmet looking great ride after ride. ASTM F1163-04A/SEI Certified & CE certified to European EN 1384 Standards* * Click on Important Helmet Warning to the right Features: Low profile 12 vent ports Ultra lightweight Rear ventilation Dial Fit System Item Specifications: Sizes: S (6 1/2 - 6 7/8), M (7 - 7 1/4), L (7 3/8 - 7 5/8)