Using these fitted sheets is a breeze. Just stretch the sheet over your super king - sized bed with a 40cm depth and make sure the tags are in the right position for an easy fit. When it comes to washing, you can use a regular gentle cycle in your washing machine. Use a mild detergent to keep the fabric in great condition. Avoid using bleach as it can damage the cotton. After washing, tumble dry on a low setting or hang them to dry. This will help maintain the sheet's softness and durability. With proper care, these sheets will last you a long time and keep providing you with a comfortable sleep experience.