LIMITED EDITION. Dreaming of a warm down duvet? The Soft Down duvet is naturally soft, breathing and, for most, just the right warmth. The standard-size down duvet, 150 x 210 cm, is filled with 60% duck down and 40% duck feathers, conforming to the Responsible Down Standard (RDS). The Soft Down duvet cover is made of cotton, with piping on the edge, washing at 60 °C. Down is a luxurious natural material that offers warm, unsweating and natural sleep. Under the Soft Down duvet, you will be gently transported to the land of Nod.