They are usually furnished with a removable liner.
US Air Force ECWCS Flight Pants - Rare –
F-1B Air Force Extreme Cold Weather Pants ECWCS
Usgi f-1b extreme cold - Gem
They are usually furnished with a removable liner.
USAF Extreme Cold Weather Type F-1B Snow Pants | Size 26 | NSN 8415-00-394-3599
USAF Extreme Cold Weather Type F-1B Snow Pants
Usaf extreme cold weather - Gem
USAF Extreme Cold Weather Trousers, F-1B [Genuine USAF Issue]
USAF Extreme Cold Weather Trousers, F-1B [Genuine USAF Issue]
USAF Extreme Cold Weather Type F-1B Snow Pants
Vintage 1978 Military Extreme Cold Weather Trousers F-1B Size 26 NOS. , Appeared to be new old stock in excellent condition., US postage $15.01.
Vintage 1978 Military Extreme Cold Weather Trousers F-1B Size 26 NOS
Usaf f-1b extreme cold - Gem
GI USAF Extreme Cold Weather F-1B Trousers— Used – McGuire Army Navy
Usaf extreme cold weather - Gem
USAF Extreme Cold Weather Type F-1B Snow Pants