Wrap your self in the softness of the luxurious 100% Cotton sheets. One of the softest fabric in the world on your bed to enjoy a perfect sleep. These soft waterbed sheets provide a lasting vibrancy of color no matter how often they are washed and are made of high strength cotton yarns that will stay soft and hold up for years to come. Machine wash in cold water. The waterbed fitted sheet is similar to the flat sheet except it has an extra triangular fabrics sewn at the four corners and both flat and fitted are sewn together by the footer so bed stays made. Experience true luxury when sleeping on our 450-Thread-Count, 100-Percent Cotton solid 100-percent cotton waterbed sheets set.The extra triangular fabric sewn at the four corners in the fitted waterbed sheet are turned over the corners of the water mattress and that is how you dress your sheets on your bed. In addition, the fitted sheet is always made few inches larger than the water mattress so the extra fabric can cover the mattress sides when made. The Poles attachment feature is an additional feature that is used to keep the triangular fabric fully opened so fitted sheet doesn’t come off easily. If your sheets include the pole attachment feature, you can insert 12 inches long wooden or plastic pole that is 0.5 inch in thickness (any pole can be used as it’s NOT INCLUDED). That Pole when inserted will keep the triangular fabric fully opened under your water mattress and makes it harder for the fitted sheet to come off