Ensure your safety while whitewater rafting with the Havoc Livery Helmet. Made to accommodate almost any head size, the DialFit system allows you to adjust the fit with the turn of a knob. The ABS plastic shell is lightweight and durable, while an EVA foam liner protects your head from impact as you advance towards the rapids. ABS plastic shell. Closed cell EVA foam liner. An adjustable chin strap ensures comfort and security. Fixed Plush FIT pads in key contact points provide extra comfort. Ratchet adjust DialFit system. Six ventilationdrainage ports let air in and water out. Fits head circumference 53 62 cm 20.86 in. 24.4 in.. Meets CE1385 standards for whitewater safety.