I ordered a 4 pack Queen and am very happy with my purchase. Arrived nicely folded and packaged. The pillowcases are terry cloth on the outside (photo 1) and more plastic on the inside (photo 2) (I assume that's "waterproof"). They have good strong zippers as they protect the cushions (Photo 3). This is not a hidden zipper. The terry cloth on the outside isn't the softest, so be sure to put a pillowcase over it. I had no reason to test the water resistance, so I can't speak to its nature. As far as I can tell from the way they are made they will be waterproof. They match my pillows perfectly. In the end I am very happy with my purchase as they do what they are supposed to do.
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