Using these Casey Cotton Fitted Sheets is a breeze. Just put the sheet on your double bed with the 50cm depth, using the tags to make sure it's in the right position. For washing, you can use a regular cycle in your washing machine with a mild detergent. Don't use bleach as it can damage the fabric. After washing, tumble dry on a low setting. To keep the sheets in great shape, avoid overloading the washing machine and don't iron at a very high temperature. With proper care, these sheets will last you a long time and keep providing you with a comfortable sleep.