Muck Boots Outmax 12" Outdoor Farm & Ranch Boots Built for outdoor conditions where moisture and mud come with the territory, this tall pull-on boot combines protective coverage with underfoot comfort. The rubber construction is 100% waterproof and 100% MUCKPROOF, helping keep wet conditions from slowing you down. BioDEWIX™ Dry with NZYM™ uses natural plant-based enzymes to help break down odor-causing material from sweat and keep feet feeling fresh. A BioLite foam midsole provides exceptional underfoot comfort, while the durable rubber outsole is ready for outdoor terrain.