My chiropractor recommended Crocs because I am having foot problems and a lot of trouble wearing regular shoes. I previously purchased a pair of Prepair II Clogs and they were perfect for every day but not so good for this cold winter. The Mercy is slightly more narrow. I do wish they were a little wider, but I am finding them to be very comfortable anyway. When I first put them on, I considered returning them. They felt different and tighter, but after a week of wear, I am finding they feel pretty good and don't flop off my feet. The more I wear them, the more I like them.