These 550 thread count sateen pillowcases truly join the ultimate in luxury with the ultimate in sustainability. The high thread count sateen weave gives an irresistible smooth silky feel, the mid-weight construction keeps you at a perfect temperature level. We urge you to inspect the material under a magnifying glass - you'll find very fine yarn made of long staple organic fiber and a tightly-woven sateen weave. What you can't see, but you'll feel, is the chemical free processing through every step. Knowing that the organic cotton touching your skin for 8 hours every night is certified organic, and is produced ethically and responsibly, you'll sleep soundly with a smile.