ive had my zoan mod for about 2 to 3 seasons now if you take a large you need a medium so on so fourth .. one size smaller than normal .. i have one sled helmet and 2 cycle ones . love the helmet and comfort .. i bought mine threw snow shack out of merril wi they are hard to come by usually sold out .. from what i understand dont quote me on this zoan is the lincoln of a g-max .. you will love it ..