Super soft knit jersey fabric, all organic cotton! Constructed with a high quality elastic that runs all the way around the bottom. The 15" pocket depth is designed to accommodate thin to thick mattresses. These organic sheets have a four inch hem at the top and a half inch hem on the sides and the bottom. Prices are for complete sheet sets and include one fitted sheet, one flat sheet, and two pillowcases (Twin and Twin XL sheets comes with one Standard envelope style pillowcase. Full and Queen sheets come with two Standard envelope style pillowcases. King sets come with two King envelope style pillowcases).