STOCK #9460 The Black Diamond Comfort Fit Form ("Last") used to construct these boots has been designed for maximum comfort and accurate fit. In addition, the Enersole System includes a high-density polyurethane midsole that absorbs energy. The second layer of comfort includes a single-density polyurethane orthotic footbed that provides all-day comfort. The footbed fabric cover absorbs perspiration and is removable for fast drying. Comfort System : Comfort Fit Plus - with Enersole Boot Height : 16 Inches Upper Midsole : 2.0MM High Density Rubber with calendared fabric Lower Midsole : 6.8MM Coated Felt Insulation : 6.0MM Open Cell Foam Leg Lining : 3.0MM Wool Felt 1.6MM Coating Leg Lining Stitch : Lining includes Kevlar-thread backstitch Toe Lining : 1.4MM Net Lining Calendared Coated Steel Toe : ANSI - Z41-1999 Standard Steel Midsole : Stainless Steel Steel Shank : Triple Ridge Steel Outsole : Rubber Calendared with Griptread Design Footbed : PU Orthotic Footbed, Fabric-covered, Removable Pull-On System : Cotton Drill Friction Coated with Spread Cotton and Nylon Net Certification : NFPA 1971-2000 Edition Standard for Structural Firefighting