This Royal Elite Hungarian Goose down duvet is an upgrade version with 400 thread count shell. It is filled with RDS certified Hungarian White Goose Down of 700 fill power. Down cluster with 700 fill power traps more air and creates more fluffiness and warmth. It is breathable to regulate body temperature during sleeping. Outside 400 thread count shell creates a plush and luxurious touch feeling, providing a cozy and comfortable sleep experience.Available in four sizes, Twin 60 x 90'', Double 80 x 90'', Queen 90 x 90'', King 106 x 90''.