Largest non-latex condoms???

So, my boyfriend and I use Skyn non-latex extra large because I'm allergic and he's very large compared to most men. The Skyn actually are just a bit restraining on him. I've thought about female condoms, but they're so expensive. We have also tried NaturalLambs from great reviews, but size varies per condom as it's not an exact process in how they make their condoms.

I seriously need some suggestions! What non-latex condoms for a huge guy should we get?