Pillow Covers

[Guest guest]

After reading here about all the mites, mite feces, fungus, and bacteria living

in my pillows, I've decided to buy protective covers to separate me from them.

I've found some made of cotton and some made of teflon. My questions:

1. Would the cotton really provide an adequate barrier?

2. Does teflon off-gas?

3. Should I keep looking for protective covers made of other materials? If so,

what's the best?

Thanks,