Ive worn custom made orthopedic footwear for over 40 years. Obviously, some feet will be in between the sizes available. I wasnt super pleased with the fit of the product. 5 but her waist trainer is size (large). They also allow for good toe movement at the end and room to grow! I have had a pair of these for over a year and still in first class condition and I have worn them every day. Most of the time it works really well. Come on Pionner, increase the sound quality of this product. Update- after trying to where these for months now found that the toe is not for me regret buy at this point I put it together in about 10 minutes, and it is now holding my 10 lb purse, two hats, and 5 jackets quite well.