Plastic Mattress Cover Moving

Does anybody use a dust mite mattress or pillow cover? Please help!?
The doctor recommended I put a dust mite mattress cover over my mattress. Well I did, and my bed sounds like a diaper or a cheap hotel bed crinkling every time I move, and it’s not very comfortable. It sounds like I’m sleeping on a plastic bag and it makes so much noise just to roll over.
Do you use a brand that is comfortable and not made of plastic-bag type of material? I seemed to help but I can’t stand sleeping on it.
I bought AllerEase, it was one of the more expensive ones. I would really really appreciate if somebody has information on a quiet, comfortable cover!
There are covers out there that are more like a soft cloth than the plastic that you’re experiencing: My mother got one while she still had a dog that slept on the bed. I forget which brand it was, but I’m pretty sure she got it at Wal-Mart or Costco.
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