The Muck Boots Men’s Summit 10' Cold Weather Performance Boots have a neoprene Strobel construction using premium quality leather. These stylish boots are 100% waterproof. The 3mm neoprene lining provides flexibility and 800g Primaloft offers breathability along with added insulation. It is lightweight with an EVA midsole and rubber outsole for improved performance even on rugged surfaces. The grommet adds style and is easier to adjust whereas the eyelet lacing offers a secure fit., 100% Waterproof Leather. Premium waterproof Leather Upper., Fully lined with 3mm Neoprene for flexibility. Neoprene Strobel construction for durability., 800g breathable Primaloft for added insulation. Quick-adjust grommet & eyelet lacing for secure fit., Lightweight EVA midsole for added comfort. Durable rubber outsole.,