What Our Gearhead(R) Experts Are Saying: "I've worn these boots on icy boat decks and flooded trails-warmth and grip are unreal. Easy to pull on, and they stay comfortable all day, even when temps tank." When the weather turns brutal and the water's rising, we trust the Simms Challenger Insulated Boot to keep our feet warm, dry, and locked in. Built with a rugged vulcanized rubber shell and 7mm neoprene insulation, this cold-weather beast is lined with grid fleece for next-to-skin comfort and long-lasting heat retention. Whether we're working in the elements or chasing late-season bites, this boot fires back at freezing temps without sacrificing flexibility or comfort. The Simms Freestone rubber outsole grips across slick docks, muddy trails, and icy ramps-and it's fully compatible with Simms Hardbite and Alumibite cleats for extra bite when needed. At 14 inches high, it shields against deep puddles and splashy conditions, while the pull-on loop makes suiting up fast and easy. It's a full-on fortress for your feet, no matter how rough the season gets.