This product did nothing to stretch even the smoothness of a new pair of leather booties. So, I knew then that my Frye boots wouldn't budge an inch. But, I tried it anyway. I did, however, like the color change of my boots and I will most likely use it again on my boots (for the color change). That's why it has three stars instead of one. This product sucks as a boot stretcher!!! Don't waste your money. But as a boot color changer, that ages it just oh so subtle, spend the money if that's your aim.