Official USGI Issue. Manufacturers vary from piece to piece as these are made for government contracts by different makers.
The USGI ECWCS Trousers are the first development of the ECWCS system. The parka and trousers serve as the windproof, waterproof layer to protect the first three layers in the system.
The trousers have seat and knee patches, pass-through pockets, and gusseted leg openings to allow easy donning and doffing without removing the boots. The trousers have an elastic drawcord with barrel lock at the waist. Nylon hook and pile fastener tapes are located at the ankle tabs to allow for adjustment. Slide fasteners are located on the legs and front fly. The trousers have nylon tape suspender loops. Snap fasteners are located above the front fly slide fastener and on the pockets.