The slipper fits on my foot; just barely.  I am a size 8 Woman's Foot and it just fits. There was no 'extra' length behind heel.  So while it fits and is comfortable, and has a nice sole, just be aware it fits &#34;EXACTLY&#34; to size.  A 8-1/2 will hang over a size 8. Order to size.  If you think it will be too tight go 1/2 size up.  But overal comfy