Using these Casey Cotton Fitted Sheets is a breeze. First, identify the tags on each side of the sheet to ensure proper placement on your double bed with a 50cm depth. Just drape it over the mattress and tuck the edges in. For the best results, wash them in cold or warm water with a gentle detergent. Avoid using bleach as it can damage the high - quality cotton fabric. You can tumble dry on a low setting, and this will help maintain the sheet's shape and softness. After drying, you can iron them on a low - heat setting if needed. With proper care, these sheets will keep you comfortable for a long time.