Does anyone use silk pillows case?

I've been using this silk pillow case for like a week now and its great, my hair doesn't become a nest after a goodnights sleeps.

Well I looked up online and most of it was more than 20£ a pair. So I looked in our local tesco and it was literally for 7£ a pair! Best 7 pounds I've ever spent
Does anyone use silk pillows case?
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