Rockport Works delivers legendary walking comfort to the people who deliver our mail with the Rockport Works PostWalk series. The PostWalk series feature our unique PI-1000 Postal Cushion Insert, designed exclusively for postal workers: 33% thicker for superior shock absorption and deep carpet cushioning over long distances day after day. Our SmartLite™ TPU outsole is oil and slip resisting. Strobel and San Crispino construction. USPS Certified. Made in USA.