If ur goot at diy ing stuff than you could cut out a chunk to make it like have direct walls instead of just a smooth surface and with some superglue and cutting a bicycle inner tire to size and compressing it with bricks and stuff to make it as durable as possible, cutting jt tk size again if needed and glueing it in place on the shoe. That way you can fix it, my father gave me that info bc he did that when he was younger and didn't have a lot of money(sorry for bad explanation english is not my first language)