These postal walking shoes have a MIL-33 moisture wicking lining and 3bar knit with durably waterproof and highly breathable fabric. These Reebok Men's Oxford shoes feature a removable PI-1000 cushion insert with shock eliminator heel cushion and "Maxium-Lite" Polyurethane Outsole. They are 100% non-metallic, toe stitched, USPS Certified and Made in USA.