The uniform was designed to be warm in winter by use of separate liners for the jackets and trousers, both made of faux fur "pile". The trouser pile liners were dropped from the final system in favor of the previous wool trousers. The jacket liner was a separate cotton-shell jacket with two slash pockets and button and loop fasteners, but it was rarely issued in practice during World War II as it was intended to be replaced by the M-1944 Eisenhower jacket, though that was made a garrison only item before the Korean War.