To use these Casey Cotton flat sheets, simply place them over your mattress. They're designed to fit long single beds, so they'll cover your bed nicely. When it comes to washing, you can use a regular laundry cycle. Use a mild detergent and avoid using bleach as it may damage the fabric. These sheets are very durable, but it's still a good idea to wash them at a moderate temperature to keep them in great shape. After washing, tumble dry on low heat. If you prefer, you can also air - dry them. That way, you'll be able to enjoy these comfortable and breathable sheets for a long time.