None of those materials, for sure!

Although alas design is possible with fiberglass, I dont see the need for it. I have nothing against fiberglass, I just dont think its good material for hockey fin. But I might change my mind one day, under different ways of using it in a fin design, fiberglass might(MIGHT !) help. Theres a palete of materials out there that can do more, better, are much longer lasting and more suitable for a game. Fiberglass and its variables seems to be excellant materials for finswimming fin, but thats it.

In fact, one of my now-prefered materials can be, or better is called "fiber-something". But its got nothing to do with fiberglass or carbon fibers, and a laimen could possibly call it rubber. I might use something else... its called development.