I have raynaud's and therefore my feet and hands easily get cold. I tried quite a few pairs of slippers, even some smaller men's. Many had a lot of the foam cushioning, but not much support or were too flimsy, so I had to return them. I think I am allergic to that foam as it seems to make my feet hurt after a while. I have a wide foot size 9 1/2 and got the 9-10, which fits wonderfully well. The heals are not loose even without socks and the toe box is wide enough for me so my does don't cramp .See full review