Big-time durability, wider widths, extended sizes. We built Big Rig from the ground up to give you the right foundation. A roomier opening gives you more space to slip them on and off, and the extra durable design is built to withstand harsh outdoor work environments like oil and gas exploration. Features: -ATS® technology provides ergonomic support on uneven terrain -U-Turn® Entry System lets people with high arches easily slip on their boots -Removable Energy Max™ anti-fatigue insole for maximum comfort -Dual-density FLX Foam™ midsole for lightweight shock absorption and cushioning -Oil- and slip-resistant Duratread™ sole provides maximum wear resistance -Debris-releasing tread design -90° heel -Goodyear welt construction -Four-row stitch pattern -ASTM F2892 EH rated