Everyone needs to take a deep breath and get a grip. They are made from Tyvek, a nearly indestructible product. You can't tear it ... try it, I dare you!!! It'll withstand heat, cold, water, even the washer and dryer.
It's a VERY durable material. It's the same stuff they "wrap" new houses with to weatherproof them.
I think you're nuts. Mine fell right apart after a few months of use last year. A couple soakings on Splash Mountain and it was done for and had to be replaced. It is definitely not Tyvek and I can definitely rip it in half if I want. :lol: