I've never had boots like this because I couldn't find any that fit my calves! These actually feel a little big. I'm usually 7.5 or 8 depending on the brand, and it's 8 more often than not so that's what I ordered. I would need to wear thick socks to keep my feet from sliding around, but that is possibly by design. Order your normal size if you expect to wear these over thicker pants and/or socks.