This is an original pair of F-1B winter flight pants. These are US Air Force issue. They are very warm and look to be all nylon shell inner and outer. I am pretty sure the insulation is polyester.  They have a rear waist band draw strap. These are dusty and dirty from use and are direct military surplus. They were picked up at a DRMO sale and put into long term storage for some reason. They are 1982 dated. Tag shows a 36 waist. I measured flat and got 18.5 not stretching them and 30 on the inseam.  Great for hunting or winter sports. 

These are being liquidated and sold as is with no returns. 

NOTE: In the US 48 if it is cheaper to send fedex we will and we will also refund the overages in shipping.