Premium Luxury 350TC Goose Down Comforter. This is the lightest weight cotton available on the market that is down proof. The end result is a seemingly weightless comfort. The ultimate in luxury. German Batiste Fabric (350TC 100% Cotton) is filled with 850 Fill Power Siberian White Goose Down. The down used in this product has been certified to the RDS standard by Control Union. Baffle box Construction creates maximize loft and comfort, and minimizes cold spots. Double stitched edge piping ensures strength and durability for years to come. Corner loops provide an easy way to tie a duvet cover on and keep it in place! All Season Weight - great for any time any place year round use.