The material is the same as duvets but since you are not underneath it doesn't work as amazing as duvets. Definitely cooler than regular pillowcases, but they get hot when you lie on them after a minute or so. I almost regret not having spent money on them, but they help a bit. Would I recommend buying them? No not at all. Maybe just buy a silk pillowcase or something cheap somewhere else. They probably work the same way.
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