After washing and pulling straight out of the dryer they were extremely wrinkled BUT not a huge deal. We live in south Florida so we don’t use the flat sheet. We only ever use a fitted sheet on the mattress. I was very pleased with the fit. We have a deep memory foam mattress and it’s hard to find snug sheets that don’t pop off every night but these tucked in perfectly snug and have not popped off at all. The pillow cases were a kinda on the small side but they work just fine. Not good for king pillows though. These barely fit our standard bamboo pillows.