Bought sizes 7w and 7m for my toddler. In comparing the two sizes side by side, wide width and medium width appeared the same, no apparent difference. Also, main reason for the return is the poor fitting on the straps. They are too long and oddly enough the velcro part underneath the straps are too short, thus you cannot pull the straps tight across the top. Maybe if your child has chubby feet and doesn't need the straps fastened tight then maybe would be ok.