Roto-molded of course, the Otter Sport Sleds are built to be a lighter weight version of the Otter Pro Sleds. Best suited for hand-pulling (each size includes a tow rope) they are the perfect choice for early season ice, game hauling and other duties such for work - ugh.). Recommended Optional Accessories: Sled Travel Cover (200018), Universal Tow Hitch Adapter (200032).