You can use Balsa wood as the sole of the shoe. Balsa wood is the strongest wood in the world. you can also use some heels and attach it to a metal base. this can be fixed to the shoe whenever you need to roller skate. And sponge will also help the comfort of the shoe. use a strong material so you can make the outside of the shoe.
(ps- if you have any doubts you can ask me by messaging me.)
thank you!
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