I can only tell you that this did NOT work on my sketcher sandals which I was trying to stretch from side to side. I did as directed, I sprayed the inside of the sandal with whatever that liquid is that is in a spray bottle (nowhere on the bottle does it tell you what’s in there), I used the shoe stretchers (which are very small, maybe good for kids shoes) for at least 48 hours and it did nothing. While looking up how to stretch shoes on You Tube I saw where people were spraying their shoes withSee full review