Using these sheets is a breeze. Simply put the fitted sheet on your double bed (50cm) first, making sure to align the tags correctly. Then, add the flat sheet and arrange your pillows. For the best results, wash the sheets before first use. When washing, use a gentle cycle with cold or warm water and a mild detergent. Avoid using bleach as it can damage the fabric. Tumble dry on low heat to keep the sheets soft. Iron on a low - medium setting if needed. With proper care, these sheets will last you a long time and continue to provide you with a comfortable sleep experience.