U.S. Military Original M1 Woodland Cold Weather Helmet LinerUS Military Original M1 Woodland Cold Weather Helmet Liner These cold weather helmet liners were first issued in the early 1960s to troops station in cold weather areas. Oxford style M81 Woodland fabric outer base, and wool synthetic inter material. To be originally worn under the standard M1 helmet, these liners can also be worn standalone as a "hood" or configured to an "ushanka" look. Great Condition Various dates and manufacturers. Early 1980s