M1941 wool knit cap with short visor designed to be worn under the steel helmet. Commonly known as the "Jeep Cap". Standard issued to all troops (yes, including paratroopers) in the Army from mid-1942.One size. ATF's US Army Jeep and Mechanic's caps are made from U.S. Made olive drab #3 100% wool tubular knit cloth. They are sewn in their shop with the correct WWII era Merrow brand serger and Union Special chain stitch machines. Unlike other repros, the tubular fabric results in a cap with no seam at the rear, just like originals. The only difference from WWII caps, is that theirs come in one size. They spoke to the mill and they explained that the newer yarn has a better "memory" than that of 60 years ago, precluding the need for multiple sizes.Washing Instructions: These are 100% wool. Do not, under any circumstances put them in a washing machine or a dryer. You will end up with a fuzzy thimble. If you need to clean one of these caps, hand wash with cold water only and air dry. Not in a dryer on "Air Only/ Air Dry/Air", I mean simply in the open air. We will not exchange or refund caps destroyed by "operator error". Made in USA, manufactured by ATF