500 Thread Count Plain Dye Flat Sheets Crafted from the finest quality yarns, this 500 thread count cotton sateen range has a lustrous sheen with a supremely soft handle, making it exquisitely comfortable to sleep on. The range includes fitted and flat sheets up to Emperor size with co-ordinating standard and oxford pillowcases. For those who prefer a more understated look, then this range is the perfect choice as it offers a plain dye duvet cover up to emperor size.