I wear a short-sleeve wool jersey from 50's to 90's and it's always comfortable. It's does get wetter from sweat, but I live in a very dry area, so that's not an issue. I like thicker socks and always wear wool (Smartwool and a couple of others that I can't remember--no big differences). I have Ibex clothing for x-c skiing, and it's the best wool stuff I've seen--I wear it every time (but you pay for it). Comfort and no smell are the big advantages.