Rothco White Athletic Crew Socks 9439. Authorized to wear with the US Army PT Uniforms, Rothco Athletic Crew Socks are designed for all day comfort. Constructed With a cotton and polyester blend, the military socks are built for comfort and performance. Featuring a ribbed top, the crew socks will stay in place while you are on the move. These athletic socks are great underneath a pair of military boots, hiking boots, and other everyday footwear. Made In USA.