To use these Casey Cotton flat sheets, simply put them on your Super King bed. For the best experience, make sure the sheet lies flat across the mattress. When it comes to washing, you can use a regular washing machine on a gentle cycle with mild detergent. Avoid using bleach as it can damage the cotton. After washing, tumble dry on a low heat setting to keep the fabric soft. These sheets are durable, but it's still a good idea to check for any loose threads or signs of wear occasionally. With proper care, they'll serve you well for a long time.