These are the best slippers I've ever worn.  I have flat feet and two heel spurs and when I finally saw a podiatrist he told me to go by croc slippers.  I don't know how much money I've spent on finding the RIGHT pair of slippers.  Deerform, memory form......you name it I've tried it.  These are the only pair that allow me to walk without severe pain.  I will not wear anything else around the house.  You can remove the fleece lining and wash them.  I wash mine on the gentle cycle and let them air dry.  Don't plan on removing the lining and just wear the croc's, they will be too large.  They really keep your feet warm also.