Waterproof Sport Hiker features a MIL-33 moisture wicking lining with a waterproof seam sealed construction. Get extra support with the removable polyurethane cushion insert with gel heel cushion insole and the dual density polyurethane outsole with full length PU foot cushion. These durable postal boots are ideal for all-day wear, keeping your feet dry and comfortable, an idela option for Letter Carriers.