Question for anyone

[graymnnce]

Some time ago I stumbled a upon a website that offered a lot of gadgets for holding extra-open mules on your feet, or keeping slingback straps from falling off - that sort of thing. They weren't very clever mechanically, more like clear plastic straps that wrapped around your foot and the shoe to hold it on, but I'm getting desperate for something like that. Can anyone give me a clue?
Thanks in advance!

Edited: Oops! I found the site - it's
Comfortable high heels and mules thanks to sexy new heel straps. Heelstraps one size fits most design will fit your new heels and the ones sitting in the closet.
But it isn't a particularly appealing solution to the problem, and it doesn't work with platforms, which is what I wanted it for.