Filson Highlander Boots keep your feet warm and dry with an insulation layer of 100% virgin wool. Filson's unique construction layers their famous 24 oz. Mackinaw wool cloth between an outer layer of rugged oil-tanned leather and an inner layer of soft water repellent leather. Adding to the comfortable fit is a wool insulated tongue that incorporates Filson's oil finish Tin Cloth with oil-tanned leather to reduce bulk while preserving the boot's insulated, waterproof properties. The long-wearing Vibram® Olympia outsole is designed for aggressive, no-slip traction, providing support and sure footing where ever you need it, even over brush and fallen logs.