The 8-inch, all-black uppers have side zippers and a standard lacing system to keep your feet securely locked inside. Tumbled, oil-tanned leather in the Thorogood boots creates the waterproof uppers. Non-metallic, engineered composite shanks provide lightweight arch support. The GenFlex2, dual-density rubber outsoles are attached utilizing Goodyear welt construction. The welt stitching around the base of the waterproof boots creates a flexible, repairable bond. The rubber soles have a gripping lug tread to keep your steps firm and safe. Hop in and out of these military boots quickly, using the tough YKK side zippers and Velcro closures. Insulation: 200 Grams of thinsulate insulation. Special Features: Thoro Dri waterproof membrane, blood-borne pathogen compliant. Material: Leather.