I purchased these sheets specifically because they are advertised as a Percale sheet set and they are a cotton blend. The sheets are decent and fit well, however, the packaging does not say Percale nor do any of the tags attached to the sheets. I have other Percale sets and the tags on those sheets say Percale as well as the packaging. I have no proof that these sheets are actually Percale weave. It is hard to tell just by looking. Percale means that there are equal numbers of threads woven in both directions. This was a very important reason why I purchased these sheets. I hope that someone can give me confirmation that they truly are percale.