UGG Classic Cardy Knit Boots

well loved but still has excellent tread and lots of life left.. was always worn with socks right foot inner sheepskin lining is worn out in the heel area (see pic 8) and the brown color is not a stain.. I suspect it is the glue residue, left foot lining is fine (see pic 9) I'm a size 8 and these fit me but my toe touches the edge... however because it is a knit material, it doesnt cause any rubbing/chafing let me know if you have any questions!