I tried these out of curiousity from seeing other people use them. I didn't really expect it to do much but wow I can't believe how much my feet peeled. Within five days my feet were peeling like crazy, and then a few days after that they were completely smooth. The box comes with two booties and one fluid ampoule for each bootie. You pour the fluid in the bootie and let it sit for an hour and a half, then rinse off. I experienced no irritation or burning or sensitivity while using it. The smoothness doesn't last very long though. The thick skin grows back as you use your feet again. This product is good for a quick fix, though.