Latex free elastic for swimwear?

Does anyone know of a latex free equivalent to rubber swim elastic? I found one shop in the UK selling latex free rubber swim elastic but shipping to the US would be $50.

I'm learning to sew my own swimwear. I have a minor latex allergy (it gives me a rash) so I can't use rubber elastic that is apparently the best option. I have cotton swim elastic but I'm running into issues with it stretching out when I try to finish the leg holes. I have clear swim elastic too but it isn't meant to be stretched that much.