IRH Ultra-Lite Trail Helmet The Ultra-Lite Trail Helmet is sporty and stylish and designed for riders of all ages. This lightweight, super breathable helmet is durable and easy to care for. It is low profile with 12 vent ports for maximum air flow. ASTM F1163-04A/SEI Certified & CE certified to European EN 1384 Standards* *Click on Important Helmet Warning to the right Features: The Dial Fit System, which allows a custom fit with just one simple turn of the dial High tech, rubberized paint finish that is soft to the touch Interchangeable head liners for fit adjustment Liners can be removed, hand washed and air dried Superior ventilation and lightweight feel makes this the perfect helmet for trail riders. You won"t even feel like you are wearing a helmet at all! Item Specifications: Sizes: Small (6 1/2- 6 7/8) Medium (7- 7 1/4) Large (7 3/8-7 5/8)