Temperatures on our hunt ranged from near freezing early in the mornings, to nearly 70 degrees one afternoon. Still, I hunted and hiked all day, across that temperature spectrum, in basically three layers: a cotton t-shirt, the Core Heavy Hoody from Sitka, and a down vest. Many of my buddies ding Sitka for the investment-banker price tags, and I get that, but they can't point me to anything less expensive that works half as well. The Core Hoody is fitted and "body mapped" with strategic lofted-fleece insulation in spots that tend to shed heat. The backside of the shirt is long, too, so it stays tucked in on those cold mornings, and didn't ride up under my pack when I untucked it on the warmer afternoons. It also has Polygiene Odor Control in the fabric, so even after five days of wearing it all day long, it didn't stink.