Fear no impact, feel no fatigue. Sierra Shock Shield® helps you stay comfortable longer absorbing impact to your feet. Extremely durable, cushioned, and heat-resistant, it's ideal for harsh outdoor jobs, high heat environments, and intense construction work. Sierra Shock Shield Work Boot Product Features : 0 : ATS® technology provides ergonomic support on uneven terrain, 1 : Shock Shield® technology diffuses heel impact while absorbing shock and helping minimize fatigue, 2 : Removable Energy Max™ anti-fatigue insole for maximum comfort, 3 : Oil- and slip-resistant Duratread™ sole provides maximum wear resistance, 4 : High heat-resistant sole, 5 : Goodyear welt construction, 6 : Four-row stitch pattern with embroidery, 7 : ASTM F2892 EH rated Men's Sierra Shock Shield Work Boots in Dark Brown, Size: 7 D Medium by Ariat