ECWCS (Extended Cold Weather Clothing System) Ski pants come to mind when trying on these warm pants. They are made of the same outer and lining as the warmest parka around, no kidding. So they have to be the best. The zip front and snap closed. They zip closed at the bottom with a cotton stretch band for added ease when sliding on boots. There is a tab at the back of the waist to pull to perfect fit. They have cargo pockets that VELCRO brand closures shut and added fabric at the rear end like military field pant.