5 or 6.0?
5.0. They are thicker than my normal sock but not TOO much. I did have to adjust my buckles a little bit. But after 2 days I'm sold on these. Did a little experiment yesterday running them on the absolute lowest setting. My feet were not toasty, but definitely not cold. I then turned them off completely and my toes became noticeably much colder quite quickly. I may pick up a pair of the 6.0's at some point however just because I really like a thin sock. But again. super happy with my purchase as of now.