Came here to say flexible plastic cutting boards.
Used to glue them in my thin squishy running shoes as a 'rock plate' for backpacking, for keeping pointy rocks from poking my foot lol
I don't see the point of it in a skate shoe
Now I just use Sole footbeds in my hiking shoes... And ski boots, ice boots, etc etc. Sole don't work so well in some shoes(too wide) but superfeet are a little narrower. I wanna try some of the other superfeets, the softer ones, to put in like, blazers, classic vans, LRAB's, etc. The classic superfeets and the SOLE boys don't have shit for heel protection, but they're great for primo protection