Our Goose Feather & Down is hygienically treated before being covered in a 100% pure luxury cotton case, then box stitched, which ensures that the filling remains even and ensures warmth distributed evenly through out the duvet. These naturally breathable duvets are certified by Zeromite (the dust mite experts!). Finally every duvet is double-stitched and piped around the outer edges. Manufactured with precision and craftsmanship. Naturally hypoallergenic feather (85%) and down (15%) are steam-cleaned and sterilised before being packed which brings you the perfect all seasons duvet with its detachable features.