Using these Casey Cotton Sheet Sets is a piece of cake. Just put the fitted sheet on your super king 40cm bed, making sure to use the tags for easy alignment. Then, add the flat sheet and pillowcases. For a good night's sleep, make sure the sheets are smooth and wrinkle - free. When it comes to washing, use a gentle cycle with mild detergent in warm water. Avoid using bleach as it can damage the high - quality cotton. After washing, tumble dry on a low setting to keep the fabric soft. Iron on a medium setting if needed. With proper care, these sheets will last you a long time and keep providing you with a comfortable sleep experience.