Weatherproof leather upper is fused seamlessly into a polyurethane sole. The patented Shock Protection System reduces foot strike shock by 33%. We've seen a few attempts at knock-offs but nothing steps up like the Original. Blundstone's adult 510 slip-on boot is an everyday casual work shoe you'll get miles of wear in. Featuring 2.5-millimeter-thick weather-proof leather, a well-designed shock protection system that reduces shock by 33 percent, and a removable Cambrelle footbed that wicks moisture away, this work boot is designed as much for comfort as for dependability. It also includes an injection-molded dual density polyurethane outsole for a softer step. This high-quality ankle work boot also has flexible elastic panels and finger loops at the top of the shoe for easy slip-on and removal.