Western Chief Men's Frontier Neoprene Mid BootDon't let the cold wet elements slow you down with these Frontier boots High quality, waterproof rubber upper Stretch Neoprene collar Lugged, slip resistant waffle traction rubber outsole 5mm Neoprene lining Removable memory foam footbed Cold rated Did you know rubber comes from trees? The process of making handmade boots involves mixing limestone and rubber to give the footwear its form. It's natural for quality rubber to develop a white film, called