There’s a reason No Iron Supima bedding is some of our best selling. More than one, in fact. The cotton, Supima®, is a rare variety grown only in the United states – prized for its extra long staple fibers that create smoother, stronger yarns with longer-lasting color. The 400 thread count sateen emanates luxury without compromising breathability. And best of all, the gentle no iron finish gets the fabric from dryer to bed without a wrinkle – for 30 washes. This duvet cover has all that, plus internal corner ties to keep your comforter from shifting.Supima is conscientiously sourced, American-grown cotton that’s farmed to minimize environmental impact. The fibers are 50% longer than standard cotton, so yarns are stronger, softer, less prone to fraying or pilling, and hold color longer.