These duvets are manufactured from a luxurious down and feather fill (50% duck down and 50% small duck feather mix) that is soft and has excellent loft and thermal properties. With a "warmth" rating of 10 - 11 tog, this duvet is ideal for spring and autumn (in summer we recommend a flat sheet instead of a duvet...with this duvet kept close at hand for the cool early hours of the morning). With its pure cotton downproof casing, this is an all natural product. Perfect for you and your family. To keep your life simple, these duvets are machine washable and can be tumble dried.