Caterpillar Footwear 89701 Silverton Men's Steel Toe Work Boots. The mid-cut, 6-inch upper is lined with a nylon mesh that wicks away moisture and delivers a breathable, dry fit while removable PU sock liners surround your feet in comfort. SuperWelt construction stitches, rather than glues, the uppers to the soles for super-strong durable, reliable wear: fully repairable for years of added life. The slip resistant rubber outsole provides perseverance to every assignment. ASTM-approved steel toes ensure safety from jobsite impacts and other accidents.