I had a Heater Body Suit, freaking hated it. I'm a skinny dude, 6', 160lbs, zero body fat, and that thing was just so incredibly bulky. How guys can get that thing on while up in a stand is beyond me. I felt like sasquatch! Now I go with a thick Merino wool base layer, then a couple layers of thinner fleece, and topped with heavy berber wind stopper fleece over that. A thick wind stopper fleece hood and a similar fleece hat, or even two, over that. Gotta wear a sleeve on the bow arm to keep all that material away from the string.