
After reading many positive reviews I bought two Twin XL models. The first thing I noticed was that the underside was made out of a smooth vinyl material. When I threw on a blanket and slept in it one night, I was disappointed. I've noticed that the slick backing material causes the sheets to slide in place while you sleep. The lids also feel like plastic. I won't buy these again. I don't need waterproof cases so I use the best quality cotton.

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