The Reebok Postal Express Oxford WP is a resilient walking shoe built on a signature Maxum-lite polyurethane outsole for long-lasting comfort and superior grip. The waterproof leather upper protects feet from inclement weather conditions, while the GORE-TEX waterproof lining prevents moisture from entering the shoe. In terms of comfort, there is a removable P1-1000 polyurethane insole and a gel heel pad for heel-striking impact absorption. There is also a Soft 3 Bar Knit moisture-wicking lining, which adds extra comfort and wicks moisture from the interior. The toe bumper is stitched for durability, and the 100% nonmetallic construction makes it metal-detector safe. This shoe is also USPS certified.