A Roomier Version of the Classic We've redesigned our iconic Chore boot with an adjustable, waterproof gusset for the perfect fit around the calf. Handcrafted from natural rubber, the classic Muck Boot neoprene adjusts to the unique contours of your foot, making these reliable work boots flexible, 100% waterproof and lightweight. These tough boots feature a rubber overlay and quick cleaning sole, allowing you more time to get on with the important stuff. The upper is reinforced in both the toe and heel area, plus additional arch support giving you the protection you need. The 5mm neoprene makes these boots lightweight and flexible, with breathable air mesh lining to keep you cool on warmer days. 100% Waterproof, 100% MUCKPROOF 5mm Neoprene Bootie for Comfort and Performance bioDEWIX Antimicrobial footbed Insert Topcover with NZYM for Odor Control and Moisture Management Breathable Mesh Sandwich-fabric Lining Improves Air Circulation Built on a True Women's Last Easy to Clean Rubber Overlays Gusset for Extended Fit (XF) whether Tucking in Bulky Pants or to Accommodate Wide Calves Recommend half sizes order up Rugged Outsole Design Steel shank for additional arch support Triple Toe and Quadruple Rubber Heel Reinforcement