This is pair of extreme cold weather trousers that were used in the USAF. Designed for use by aircrew members stationed in extremely cold static areas.
USAF Extreme Cold Weather Type F-1B Snow Pants
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品数豊富! Cold F-1B - 希少 Pants 70s Weather Extreme USmilitary F-1B F1b flight pants パンツ
USAF Pants Cold/Wet Weather Trousers Medium Regular 海外 即決 - スキル、知識
They are usually furnished with a removable liner.
USAF Extreme Cold Weather Type F-1B Snow Pants | Size 26 | NSN 8415-00-394-3599
Extreme Cold Trousers F-1b
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