I've had "silk" pillowcases before, and they weren't really silk, but I liked them. So I ordered this Zimasilk case, thinking it was more of the same, but it's a step about the others I've had, both in the silkiness, and the fact that there's a zipper on the end. This is pure genius, because with all the other non-zippered pillowcases I've had, the pillows have always slipped out of the case. Adding a zipper solves that problem. I recommend this product.