I'm not a bedwetter, at least not since I was about 5 or 6 years old (Saddly I was never diapered for it..but did have a crinkly cover over my mattress).
As for diapers, I only wear 1 or 2 nights a week at most, for fun. When I do wear I often soak them, I wear Abena X-Plus with a booster so I don't really have problems with leaks, but every now and then it happens.
Not wanting to ruin my mattress, I decided that it would be good to get a mattress protector. I bought a "Allergy Luxe" Brand "Premium Mattress Protector" (It's actually marketed as a "Premium Mattress Bed Bug Berrier"...I don't have bed bugs...I think I'd rather be a bedwetter than have bed bugs )
Anyhow, one of the mattress protector's many specs is, that it is "Waterproof". It's made from 100% Micropolyester. It seems very soft to the touch, and doesn't seem like it would be "Crinkly" (in the loud sense...) But once you put it on the mattress, even with a fitted mattress pad, and fitted sheet over it...it sounds like the crinkly cover that I remeber from my childhood.
I'll probably take it off if I have any female company in bed (but it's been a while since I've had that ) So I guess I don't have to worry.