Cotton pillowcase covers are really good, but some of them have had zippers that fail. Nonetheless, most of the time, the many I have ordered over several yrs. are just fine! I keep re-ordering because the quality is good for the $$, and for the price, you can't beat it!
This was strictly a "value purchase." So far the quality seems good. They fit snuggly (but not too tight) over a standard bed pillow. Because I haven't washed and dried them yet, I can't tell whether they might shrink. I'll probably avoid washing and drying them on hot temperatures so they don't.