Using your Sferra Celeste California King bottom fitted sheet is a breeze. Just put it on your mattress as you would with any other fitted sheet. When it's time to clean, machine wash it in warm water on the gentle cycle. Remember not to use bleach because it can weaken the fabric and make it turn yellow. Also, avoid using fabric softener. Wash dark - colored sheets separately. After washing, tumble dry on low heat and take it out while it's still a bit damp. You can use a steam iron on the 'cotton' setting if needed. With these simple steps, your sheet will stay in great condition for a long time.