I purchased one, and I was so impressed, I wouldn't review the item until I ordered 2 more. I was afraid they would sell out. I have owned comparably priced silk pillowcases before, but these are far superior. The zipper is small, smooth and unnoticeable, and keeps the pillow from slipping out. My pillow is standard size, but I purchased queen pillowcases for that little bit of extra room, and they are simply perfect.