What is the Endy Duvet Cover made of? Administrator 23 January 2020 15:47 Updated The Endy Duvet Cover and shams are made from 300 thread count organic cotton in a single-pick, sateen weave. Related articles Does the Endy Duvet need a cover? What is the Endy Organic Cotton Duvet Cover thread count? What is the difference between a duvet and a comforter? Do you carry a Single or Double size Mattress? What are the dimensions of the Endy Organic Cotton Duvet Cover?