German cold weather pants.  Judging by the stock photo, these cold weather pant liners seem more fitted compared the the M65 pant liners from the US military.  Not that you would just wear these by themselves but you could.  It'd just be kinda weird.  

Upper: 100% Polyamide, Rip stop fabric
Lining: 100% Polyester
Padding: 100% Polyester

- elastic hem with 2-way-zipper and hook and loop closure
- ventilation holes on crotch
- adjustable leg width by zipper