I wear a size 7 to 7.5 shoe size, so I ordered the small stretcher (4 to 6.5) because that's what other reviewers recommended. THANK YOU!! This works great. I have very wide feet. To make things worse, one foot seems to be a little bit wider than the other. I have been able to stretch out three shoes now and my feet are so happy. I'm happy! It's easy to use. I didn't need to use a solution either. My tallest heel is 3.75 inches and I had no problem using this.