Love isotoner slippers.  I live in them once I get home from work and kick off the heels.  This slipper has more of a 'sole' that my other ones.  It's fine though.  Very comfy.  There is forgiveness on size.  I am usually a 9 or 9.5 in shoes.  These fit 9.5 to size 10 but they are not big at all.