I know I have four. I originally bought another brand for my daughter's Allregies dust mites that was twice the price. The only downside is that they are a bit slippery so you need some fabric between the box spring and the mattress. The rest of the material seems good. The zippers aren't as high quality as in my other cases, but they will do their job. I had no problems on my first try and ordered three more as I liked the price and thought they would work just as well as the more expensive ones.
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