I don't have the 110 but do have 2030s and 2045s. From my experience with those, and what people have discussed regarding the 110, I agree with ryden. I went with a 7.5 on the 2030 and 2045. I now think I could have gone with a 7 on the 2045 if I didn't want to wear thick socks. So when/if I purchase a 110-lasted boot, I would go with a 7, I think.