Using these sheets is a piece of cake. First, just put the fitted sheet on your super king - sized 40cm deep bed. The tags on the sides will help you get it in the right position easily. Then, place the pillowcases on your pillows. When it comes to washing, you can use a regular laundry cycle. These sheets are made of high - quality cotton, so they'll hold up well even after many washes. Just use a mild detergent and avoid using bleach, as it might damage the fabric. After washing, tumble dry on a low - heat setting or hang them to dry. This will keep them looking and feeling great for a long time.