Using these Casey Cotton Fitted Sheets is a breeze. Just place the sheet on your king single 50cm bed, align it with the tags to ensure a proper fit. When it comes to washing, use a gentle cycle with mild detergent. You can wash them in warm water, but avoid using bleach as it may damage the fabric. Hang them to dry or use a low - heat setting in the dryer. After drying, simply smooth out the wrinkles and put them back on your bed. These sheets are durable, but to keep them in great condition for a long time, don't over - stretch them when putting them on or taking them off the bed.