Dearfoam is a company that has been around for a long time.

I  looked at their size chart, picked my choices so I knew what size to pick.  I wear a Size 8 or 8 1/2 shoe, but I have very wide feet, so I ordered these slippers in a Size Large, which is 9-10, which is also the recommended size. My feet almost reach the top of the slipper, and across the front of my foot it feels a little snug, tight, but if I had ordered these slippers in an extra large they probably would feel better across the front of my foot, but then  I could be swimming in them.

Slippers seem almost as hard for me to fit correctly as shoes!  They say you can machine wash the slippers, but I would be worried that they would shrink.  Then they really wouldn't fit!  I am hoping that with wear they might stretch out a bit.  Otherwise, I do like these slippers.