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 Duvet Cover thread count? What do you put in a duvet cover in the summer? Do you carry a Single or Double size Mattress? Can another duvet fit/work with the Endy Duvet Cover?