The fur ruff on the hood is also fixed to the shell of an EX-48/M-48 and is of wolf, coyote or often wolverine. The M-48 parka was costly to produce and therefore only in production for around one year. The pockets were wool lined both inside and out. The cuffs had two buttons for securing tightly around a wearer's wrist. The later more mass-produced M-51 parka had just the one cuff button. The liner had a built in chest pocket which again was unique to the M-48 parka.