With extended sizes and widths, generous fit, roomier opening and deeper scallop to accommodate high insteps and wider calves, the Big Rig is built to address the needs of all customers. This all-weather edition features waterproof construction to keep you protected and comfortable. ATS® technology for stability and all-day comfort Waterproof PRO construction with an impermeable barrier U-Turn® Entry System allows easier entry for high arches Waterproof full-grain leather Removable Energy Max anti-fatigue insole for maximum comfort Dual-density FLX Foam™ midsole for lightweight shock absorption and cushioning Durable oil- and slip-resistant Duratread™ sole Debris-releasing tread design 90° heel Goodyear welt construction Four-row stitch pattern