USGI Impermeable Extreme Cold Weather Jacket

US military extreme cold weather jacket. Impermeable to water and keep in heat very well. Used for decades they made a high impact on 70s and 80s fashion design. These are in unused condition with just some small storage creases and wear. These sizes fit a little larger than listed. For instance I personally wear US large to X-large and the medium size fit me perfectly. Dates range from late 70s to early 80s.