Filling: 85% White Duck Feather & 15% Down Duvet (650gsm) is covered in a finely Quality Microfiber Fabric / Cotton, Down Proof, Anti Dust Mite, Anti-Allergy, Noiseless. Pocket Stitched, (as in the photo), therefore keeping all the feather equally spread across the duvet 100% Natural Comfort Anti Dust Mite Casing.