Using these Casey Cotton Fitted Sheets is a breeze. Just place the sheet on your double bed with the 40cm depth and use the tags on each side to make sure it's positioned correctly. When it comes to washing, you can toss them in the washing machine on a gentle cycle with mild detergent. Avoid using bleach as it may damage the fabric. After washing, tumble dry on low heat to maintain their softness. To keep them looking their best, don't overcrowd them in the dryer. And always check the care label for any specific instructions. With proper care, these sheets will serve you well for a long time and continue to provide you with a comfortable sleep experience.