A1HC Duvet Covers are made from single pick long staple Organic Cotton with ultra tight weave for unencumbered sleep. Built for comfort and durability, the feel will improve with every wash. This duvet cover is GOTS certified Organic Cotton which means our cotton is Grown without any GMOs, pesticides, herbicides, or insecticides. The yarn is naturally dyed without any toxic chemicals. Our duvet is certified organic via the prestigious Global Organic Textile Standard (GOTS) so they're healthier for you and the environment. The weave is a single pick, 1x1, 310tc Sateen. Check out our entire product line to find the most comfortable, highest quality bedding to brighten your decor and keep you warm or cool no matter the season.