I've got 2 words for you: artic shield. I have the h1 parka and the h4 pullover or h3 i disremember which one that thing is. But anyway I wore a long underwear and the lighter pullover most of last year, until january when it got pretty cold. Pack your stuff in, either on your backpack on strapped to your climber, bibs everything so you don't work up a sweat cuz that sweat will freeze to your skin if it's trapped under a bunch of layers. But this stuff is light, not super bulky and incredibly warm and i hunt in illinois and love it!