Our U.S. Polo Assn. (USPA) online store offers an extensive selection of classically styled, high quality, casual clothing, including denim, khakis, polo shirts, tees. Free Ground Shipping No Minimum!Since 1890, the U.S. Polo Association® has governed the sport of polo. U.S. POLO ASSN. brand speaks to what is authentic about the sport, honors the tradition and grandeur of polo, and creates an inclusive environment where everyone can be a apart of something special.