Otter Outdoors Hyfax Runner Utility Sled Accessory - Give extra life to your Otter Sled! The Otter Sled Hyfax Runner Kits are rugged, and dependable! They are the ideal choice for the high-miler who needs extreme durability for those long hauls! 5/8 thick, high-density plastic runners bolt into the molded-in pockets on the bottom of your Otter Sled. Multiple Sizes Available Protect the bottom of your Otter Shelter Adds extreme durability for long hauls 5/8 thick, high density plastic runners Bolts into sleds Roto-Molded pockets Works on Otter Pro Sleds