I needed some boots to go over sweats, socks, etc with my larger calves.  These are PERFECT.  Not only do they fit just right, but they are also very comfortable while I'm trekking around our property in the tall grass, deep mud, water, fallen trees, etc.  I had a different pair of Bogs before that were too snug on the calves, so they were gifted to my Mom.  I highly recommend these.