Using these Casey Cotton sheet sets is a breeze. Just put the fitted sheet on your king single 40cm bed, making sure to align it according to the tags. Then lay the flat sheet over the bed and tuck it in neatly. Add the pillowcases on your pillows. When it comes to washing, you can use a regular cycle with a 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 signs of wear and tear every few months. If you notice any loose threads, you can simply trim them with scissors.