They were so comfortable right out of the bag. The sock was a little tight when I put my foot in. I usually wear a 10.5 but ordered an 11 based on other reviews. They fit perfectly. I didn't buy them for training but to walk around the house. As they are not laced I don't think you can walk in them. Even as casual shoes, you need to replace thin insoles. I simply removed them and through Dr. Replaces Scholl's Active Series insoles, which is what I do with most of my shoes anyway.