I read once that silky smooth pillowcases help to stop wrinkles and stops tangles in your hair while you sleep, if you have longer hair. I tried it once and have been hooked on using them as it really does help with the hair thing (the wrinkles we will see in time!) These are just the ticket. You do have to purchase silky pillowcases a bit more often than cotton ones because over time they lose their shine and some brands get snaggy. It seems to just be the nature of the beast, as I have tried many kinds and they all wind down after a year or two of regular use. I have not had these long, but they look to be of good quality for the price and time will tell how long I can use them for my beauty sleep.