Using these Casey cotton sheet sets is a breeze. Just put the fitted sheet on your queen - sized bed with the 60cm dimension, following the tags for a perfect fit. Then add the flat sheet and your favorite pillowcases. When it comes to washing, you can use your regular laundry detergent. Wash them in warm water on a gentle cycle to keep the fabric in good condition. Avoid using bleach as it might damage the cotton. After washing, tumble dry on low heat. To maintain their softness and durability, it's a good idea to wash them every one to two weeks, depending on your usage. This way, you'll always enjoy a comfortable and restful sleep.