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. Features: -ATS® technology provides ergonomic support on uneven terrain -DRYShield™ waterproof breathable construction -Shock Shield® technology diffuses heel impact while absorbing shock and helping minimize fatigue -Removable Energy Max™ anti-fatigue insole for maximum comfort -Oil- and slip-resistant Duratread™ sole provides maximum wear resistance -High heat-resistant sole -90° heel -Goodyear welt construction -Four-row stitch pattern with embroidery -ASTM F2892 EH rated