Sheets that are cotton but when you feel of them they have a silky feel to them. Cotton is bad to wrinkle then you need to iron or steam the wrinkles out, but these take them out of the dryer give them a shake, as you are folding them give them a smooth wipe no more wrinkles. Hate those pill balls that happen on cotton you are picking them off well with these there is no pills to pluck. A big plus with this sheet set it doesn't have harsh chemicals they are formaldehyde free. Also they fit your mattress wonderfully the deep pockets so you not having a mattress tango trying to pull and stretch them in place. If you need new sheets then look for these give them a try I believe you will love them.