My shoes range in size from an 8-9 but it really depends on the shoe, brand, etc. i just bought a pair of size 9 shoetrees and they barely fit in to one of my pairs of black leather shoes. It's kinda hard to get them and even harder to get them out. It's a very tight fit lengthwise and i can't compress the shoetree anymore than it is. I didnt think to ask the guy at the store because the trees looked very adjustable and they are i guess but i tend to think it's more of a 9-10 size then an 8-9.