Virtually every military force issues some version of the watch cap. This US Watch Cap was designed for use by the US military who issues watch caps to soldiers at bases who are stationed outside. Soldiers who wore these watch caps were so impressed by how well they performed, they began to seek out commercial versions for use once their enlistment was over.
The same factory that produces these watch caps for the US military has begun to sell them commercially. Recognizing a demand for their product, they have created several new colors that have not seen use in the armed forces. Now you can have the same watch cap that our soldiers wear, and be able to select the color that you prefer for your cap.