Title: Nice concept - Poor design
Review: If your foot is anything bigger than 8.5 mens, then don't even bother! Even with a smaller foot, you probably won't be able to use them with modern tennis shoes, as they won't fit. There must be a reason that the photo on the box pictures a person wearing loafers - When's the last time you mowed your lawn wearing dress shoes? Then there's the strapping system with its completely useless instructions. Did the person that designed the system actually try it out to see if it works? I don't think so! Bottom line - Save your money or just get a Rubik's Cube, it's easier to figure out and would probably fit better on your foot.
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