Size: 7 (55cm) The CAP FIELD PILE M-1951 features earflaps and uses alpaca pile. This M-51 had the alpaca removed from the visor due to the disadvantage that the alpaca pile on the visor got in the way when wearing a helmet, starting from the Korean War. From the shape with the flaps down, it seems to have also been called the "Cocker Spaniel Cap." In the extremely cold Korean Peninsula, it was also used as a liner for the M1 helmet. Condition: It's an old item, but there is no noticeable damage, and the condition is good. 50s US Army M-51 MQ-1 Field Pile Cap Olive size 7 (55cm)