I tried this on a pair of shoes.  My right foot is bigger than my left and I needed to make it larger so my toe would not press against the shoe.  I tried it several times and left it in there for 2 days.  It did not do anything.  I brought the shoe to a shoe repair shop for him to make it larger.  He used the exact shoe stretcher that I had used.  He left the shoe stretcher in there for 4 days with no results.  I don't know if it is the shoe stretcher that is the problem or if for some reason it's the shoes.  I do not feel there is anything wrong with the shoes stretcher and I am going to give it to my mother to try as she has bunions which make it difficult to get shoes that fit.  I gave it 3 stars simply because it didn't work, not because it is a bad product.