Using your Sferra Fiona Twin XL Fitted Sheet is easy. Just put it on your twin XL mattress. When it's time to clean it, machine wash it in warm water on a gentle cycle. Make sure not to 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 it loses its shine, you can iron it on the 'cotton' setting to make it look great again.