Knit caps in military service go all the way back to the Crimean War and perhaps earlier. Their civilian popularity began in the 1940s after the Second World War. They were very common with naval crews in the northern oceans and submarine crews in the depths. Their lightweight construction made them easy to shove in a pocket when not needed, their length allowed them to be pulled low over the ears, and the wool they were made from stayed warm even when wet. That last point is a big one. Wool is magic. Wool is the only material that retains all of its thermal properties when wet.
Jeep Caps were originally issued to U.S. Troops in early 1942, and officers hated them because they thought they looked unprofessional. Like absolutely despised them. But enlisted men adored them. most likely for the warmth and comfort they offered, but also probably a little because the officers hated them, lets be real here.
These aren't the same as the Second World War ones, but they're the same functionally speaking.
These watch caps are available in black and a very pleasing OD green.
Oh yeah, these are 100% made in America by Americans. Not imported.