How we made our shoes:
1) we took a piece of foam the size of an 18 egg carton
2) we glued foam core board to it, so there would be something hard to keep it stable that we could put our foot on
3) then on the other side of the foam we put another type of foam that is more sturdy and not very thick
4) we stuffed cotton balls and hunks of foam in between a fleece fabric and the bottom of the shoe
5) we put velcro around the whole show to keep it on our foot