Why not build your own with LEGO and a glue gun?
Well, this is why.
In fairness, maker Vimal Patel admits:
This was a quick experiment into combining LEGO with other materials. To build on the shoe, I used a dremel and a hot glue gun to fix a few LEGO connection points. From there, it was straightforward to experiment with different designs and test their functionality. It works reasonably well, but I’m sure it can be done much better with a bit of effort.