U.S. Army Patrol Cap, Genuine Surplus, Used, Digital Camo. Size (7 3/8), slightly smaller than 58cm. The upper inside has a map pocket for holding maps, hence the name "Patrol Cap." However, this style of cap is also known as a BDU cap, field cap, or Ranger cap, and is a basic style of U.S. military equipment. The back of the head has Velcro for attaching a name tape, and a very hard material is used for the brim's core. There are scratches on the brim from the beginning. Recommended for those seeking authenticity. Currently, it's selling out fast and is a hard-to-find item.