As a citizen of the far north, I think wool is right up there with down. Although heavy, it's warm, stylish, and functional. I use a light wool Pendelton jacket. I wear it all the time. I use it to supplement a poncho liner tq. It's more than dual purpose. I can through a shell over it, take off the shell when I come in, leaving my thermostat at 64. Wear it a lot. Smartwool stuff is great but pricey. Everybody knows about their socks. Their long underwear is great. You can wear it for days and days and it doesn't stink. It's good for anything under 70 degrees. Wool cap for sleeping outdoors. I could go on and on. Water resistant. Time tested. Durable. Comfortable as all get out on a chilly night.