The Heritage Series boots were specifically designed by combining key features from the original United States Military Purchase Description, while incorporating the best elements from today's available footwear technology. The results are combat-ready footwear built with genuine materials and authentic construction. Each boot is built with a Panama outsole that is vulcanized directly to the upper using genuine direct molded sold (DMS) construction. The boots also feature genuine full-grain leather, brass hardware and Dimensions removable polyurethane footbed, guaranteed maximum comfort and performance. For boots that require spike protection, OD:30 has upgraded the traditional steel plate in favor of our Strata anti-penetration solution that conforms to an ASTM-F2413-11 standard.