Using your new cotton flannel sheet set is a breeze. Simply put the fitted sheet on your mattress first, making sure the elastic edges fit snugly around the corners. Then lay the flat sheet over the bed and place the pillowcases on your pillows. When it comes to care, just throw the sheets in the washing machine for a regular cycle. Avoid using bleach as it might damage the fabric. After washing, tumble dry on a low - heat setting to keep the softness intact. To maintain the quality of your sheet set, it's a good idea to wash it every couple of weeks. This will keep it fresh and comfortable for a long time.