Kenetrek's Lineman Extreme 1000 ST Boots were specifically designed for heavy outdoor workers such as linemen, cable installers, arborists, and tree service workers. The upper portion is composed of 10 inches of 2.8mm thick full grain leather with reinforced double and triple stitching in high wear areas. For extra support in difficult terrain, the Lineman Extreme 1000 ST Boots feature 7mm nylon midsoles as well as custom K-73 outsoles for superior traction. A protective rubber toe cap delivers abrasion resistance and a steel safety toe meets ASTM F2412-11 and ASTM F2413-11 impact, compression, and electrical hazard safety standards. Additionally, the Lineman Extreme 1000 ST is outfitted with 1000 grams of Thinsulate insulation to keep your feet warm. Features of the Lineman Extreme 1000 ST Boots:10" tall 2.8mm thick full grain leather uppersReinforced double and triple stitching in high wear areas7mm nylon midsoles for extra support in difficult terrainSteel safety toe meets ASTM F2412-11 and ASTM F2413-11 impact, compression, and electrical hazard safety standardsBoot hardware that swivels instead of breakingProtected rubber toe cap for extra abrasion resistanceWindtex waterproof breathable flexible membrane keeps water out but allows perspiration vapor to escape1000 gram Thinsulate insulation for extreme coldCustom K-73 outsoles provide excellent traction and durability Kenetrek Boots Kenetrek Lineman Extreme 1000 ST Brown Work Boots KE-410-L1, 14M