AZLSCN Custom Photo Pillowcase Pillowcase covers is made from cotton . It is a zipper. It is not a silk pillowcase, nor satin pillowcase, cotton compared to thinner, cooler, and environmental protection Pillowcase standard is that it is double-sided printed.Does not include the pillow core. Note: For better print results, you provide images of pixels the higher the better, preferably not less than 1000 * 1000 pixels.