Using these Casey Cotton Sheet Sets is a breeze. Just put the fitted sheet on your double bed with the 40cm depth, following the tags for an easy and correct fit. Then, lay the flat sheet over it and add your pillows. For a great night's sleep, make sure the sheets are smooth and free of wrinkles. When it comes to cleaning, you can machine - wash these sheets in cold or warm water. Use a mild detergent to keep the fabric soft and in good condition. Avoid using bleach as it can damage the cotton. After washing, tumble - dry on a low setting. To maintain their durability, don't over - dry them. If you want, you can iron the sheets on a medium heat setting to keep them looking crisp. These sheets are designed to last through many washes, so you can enjoy their comfort for a long time.