Using your Sferra Fiona King Flat Sheet is a breeze. Just put it on your king - size bed for a luxurious sleep experience. When it's time to clean, remember to machine wash it in warm water on a gentle cycle. Don't use bleach because it can damage the fabric and make it turn yellow. Also, don't use fabric softener. Wash dark - colored sheets separately to prevent color bleeding. After washing, tumble dry on low heat and take it out while it's still a bit damp. If you want to make it look shiny again, iron it on the 'cotton' setting.