I could not believe how comfortable these shoes were! I ordered them in my usual size, and they fit absolutely perfectly with plenty of support. There wasn't that period of "breaking in" at all either. When I went running for the first time with these shoes (track), it felt like I was running on a cloud. I've had major knee problems in the past and have been in physical therapy for my knee. These shoes did not aggravate my knee problems at all. Great shoe, and I highly recommend them.