I work from home and have cold flat feet all the time. I've tried other warm indoor shoes/slippers but none of them had arch support so I have to return them. I found these and am very satisfied. The arch insert is removable and the shoe came with a second set of inserts that appear to have a slightly smaller arch. A faux fur lining covers the inside of the shoe, except for the insole where the insert sits. The lower part is made of non-slip material, ideal for walking around the house. I just received it today and am happy with it. My feet are finally warm. I will add an update if anything changes.