Marimekko Unikko Duvet Cover (King)The Unikko pattern duvet cover is made of unbleached 200 TC organic cotton percale. Hand openings at the top corners make changing the covers easier. Unikko was created by Maija Isola in 1964 and has since become an international icon of print design. The founder of Marimekko, Armi Ratia, believed that it was not possible to faithfully capture the true essence of real flowers in print, which is why floral prints were earlier excluded from Marimekko