One is much looser than the other, too. And I like the price ??, I don?t need expensive things for this. These are mad of rubber and I do not know how long they will last. Putting on top of bed comforters, or even your legs can accumulate the heat super fast. (there and back) on our 2,000 mile road trip. I actually had to switch my few coats to my dress shirts so it wasnt as heavy. I wear 11s in Adidas. I installed these in my day spa. Giving these slippers four stars for comfort. Anyways that?s my incredible experience with the KF precision rings.