Rocky Men's 8" Alpha Force Side Zipper Waterproof Insulated Duty Boot-RKYD011 Full-grain leather and 900 denier nylon Rubber sole Shaft measures approximately 8" from arch Full-grain leather and 900 denier nylon combination upper Non-Metallic Stabilizer. Side Zipper. Rocky Airport Footbed-Cushioning 400 Grams of Thinsulate Ultra Insulation Oil and Slip-Resistant RigiTrac molded EVA/rubber outsole Guaranteed Rocky waterproof construction