You have to love military surplus for these!  These mittens are true expedition-quality, no compromises.  They will keep your hands warm in unthinkable cold.  You can fit all 4 fingers in the large mitten area for warmth, or move your trigger finger over for shooting.  The trigger finger is a bit bulky, and difficult to operate the trigger with, but that's because without the insulation it wouldn't keep you warm.  These are comparable to civilian Outdoor Research mittens that cost $150-250.