I went through 5 different sizes to figure this out. Some things I wish the assembly instructions had said:- Consider final placement when choosing where to assemble. This rack is great. I never order shoes over the internet due to my one foot having a bunion problem and should try shoes on before purchasing, but this time I decided to give it a try and they feel very comfortable. Each are valid in their own way, not least one is closed-back the other open-back. The size was a little bigger than expected but thats fine. Wave walk soul was recommended by orthopaedic surgeon. Recomendo demais. Overall, I would purchase again and I would recommend this product to my friends. I got really annoyed when it stopped working.