Using these Casey cotton fitted sheets is easy. Just put the sheet over your super king bed with the 50cm depth. The tags on each side will help you make sure it's placed correctly. When it comes to washing, you can use your regular laundry detergent. These sheets are machine - washable and can withstand multiple cycles. For best results, follow the care instructions on the label. To keep them looking and feeling great, avoid using harsh chemicals or bleach. Also, don't over - dry them in the dryer. Hang them to dry if possible. With proper care, these sheets will serve you well for a long time.