The minute I received my sheets, I laundered them as shown on the package....Cold Water, delicate and low heat dryer setting. This surprised me as whites would usually be washed by me on the warm, if not hot, setting. Guess this prevents wrinkling. Anyway they came out almost wrinkle free. The package says "up to 20" mattress" for the fitted sheet. That is not true as I have a 15" mattress. The fitted sheet JUST covered it with no extra material on the sides to tuck under the mattress. Acceptable, but not great. The sheets have a silky feel to them that made turning in the bed easy and pleasurable. For the money, these are a very nice buy. I would wish that there was an option to buy additional king pillow cases as I always have four on my bed.