Haven't been able to find sheets that fit my extra thick mattress. until now.  Though the label says wash in cold water, I wash my on warm and and dry on med-high.  Some shrinkage the first time, but they are so generously sized they are still an easy fit.  They are not "silky", if that's what you want get sateen.  They are a soft, thick cotton, exactly how I like sheets to be.