I have medium size hands. I've been wearing the medium size Napowool Navy version for 4 days. They are starting to break in but still tight especially the thumbs being very tight. They aren't very warm at all, which, honestly I like because i hate having sweaty hands in gloves. So i guess that means they breath very well. The blue looks good, although i would like to see a dark green wool next time or a heather grey wool color. I would buy another pair but probably one size larger.