Love the sheets in spite of several frustrations. They are wrapped in a ribbon that says 100% cotton, however they are a blend. I hope they don't end up being hot, but I know that polyester has been vastly improved in recent years by being microfiber thread. The color is a muted turquoise, exactly what I was hoping Blue Haze would be, so I am pleased with that. And they come with 4 pillowcases, and I am happy about that, since we always have 4 pillows on the bed. However, here is where I get less than happy. The pillowcases are all standard size in my California King set. The package says it should have king cases, in fact I sent them back once and received an identical set with standard cases. It isn't worth contacting customer service yet again for the same problem, so I will have to use non matching cases for our king pillows.