I originally order my regular size of 8.5. The boot I received felt like a 9.5 but kept them installing another insole on top of the insole that came with the boot and wear them every day, no problem. Since the boot was a great value, I ordered a 7.5. They fit okay but wished I ordered an 8. No worries, they're still wearable and comfortable enough but really can't wear a thick sock with them. They're my Summer boots. Just thought I'd update anyone wanting to buy a pair. Currently, this boot is sold out, so when they make a come back, if they do, sizing may be different. Lots of comments on this boot being a bigger size. If they comeback and sizing is different, hopefully they inform everyone.