One Size, with included fitting pads for customized comfort and fit. Check out the sick design of this helmet! Not only is it engineered for maximum comfort with nylon webbing, it also is made with ¾ extra material around the edge for a helmet that will last you a long time and provide you with the solid helmet you’re looking for. Take this helmet with you to Oregon and check out the Rogue River. Class IV rapids and Class V view for the entire trip.