Using these sheets is easy. First, place the fitted sheet on your mattress. Thanks to the Universal Fit™ elastic and extra - deep pockets, it should fit securely on mattresses between 6 to 18 inches deep. Then, drape the flat sheet over the bed. You can also put the pillowcases on your pillows. For maintenance, you can machine - wash these sheets in cold water on a gentle cycle. Use a mild detergent. Avoid using bleach as it can damage the cotton fibers. After washing, tumble dry on low heat. These sheets are made of high - quality cotton, so with proper care, they'll last for a long time, and you can enjoy their softness and breathability for years, as guaranteed by the 3 - year warranty.