A delicious hamburger featuring a grilled beef patty layered with fresh Burger with beef patty lettuce onion tomato ketchup Premium Photo Hamburger with Beef Patty, Lettuce, Tomato and Onion. Stock Image Premium Photo A hamburger with lettuce tomato and cheese Beef Cheese Hamburger with Lettuce Tomato Stock Image Image of meal Beef Cheese Hamburger with Lettuce Tomato Stock Photo Image of meal. The NRS Havoc Helmet is your one size fits most solution to whitewater safety. Our DialFit system lets you quickly and easily adjust the fit to accommodate almost any head size. Protect nearly any adult with the same helmet. No more mixing and matching. The ratchet adjust DialFit system lets you custom fit the Havoc with the simple twist of a knob. Fits head circumference 55 59cm (21. 5" 23"). An adjustable chin strap ensures comfort and security. Plush FIT pads in key contact points provide extra comfort. Six ventilation drainage ports let air in and water out. ABS plastic shell is lightweight and durable. Glued in EVA foam liner offers excellent impact protection. Meets CE 1385 standards for whitewater safety. Certification: CE EN 1385 Weight: 1 lb Shell Material: ABS plastic Liner Material: Closed cell EVA foam Vented: Yes Adjustment: DialFit adjustment Ear Coverage: No Features: 6 ventilation drain holes