Using these flat sheets is easy. Just place them smoothly over your super king bed. They fit all standard super king mattresses. For a great look, tuck the edges neatly under the mattress. When it comes to cleaning, you can machine - wash them in cold or warm water on a gentle cycle. Use a mild detergent to keep the fabric in good condition. Avoid using bleach as it might damage the color and quality of the cotton. After washing, tumble dry on a low setting. To keep them looking new, iron on a low heat if needed. These sheets are built to last, so with proper care, you'll enjoy their comfort for a long time.