Create the ultimate sleep space with the Serta® Perfect Sleeper® Ultimate Microfiber Sheet Set. The set comes with 1 flat sheet, 1 fitted sheet, and 2 pillowcases with the Twin size or 4 pillowcases for the Full, Queen, and King size. These sheets are made of 100% polyester microfiber that has been double brushed for ultimate softness. The NANOTEX technology provides moisture wicking to help you stay at a comfortable temperature throughout the night. With an extra-wide boxer hem, the fitted sheet will have a perfectly secure fit to mattresses up to 18" deep. Pair these sheets with other Serta® branded products such as a down alternative comforter or pillow to complete your sleep space. What is included with this product? When you order the Serta® Perfect Sleeper® Ultimate Microfiber Sheet Set in Full, Queen, or King size you will receive 1 flat sheet, 1 fitted sheet, and 4 pillowcases. The Twin set comes with 1 flat sheet, 1 fitted sheet, and 2 pillowcases. How deep are the fitted sheet pockets? How tall of a mattress does the fitted sheet fit? The fitted sheet is able to fit mattresses up to 18" deep. Our exclusive boxer hem gives you a perfectly secure fit. Does the elastic on the fitted sheet go around the whole sheet? The Serta® Perfect Sleeper® Ultimate Microfiber Sheet Set has a boxer hem that goes around the whole fitted sheet for a perfectly secure fit. What fabric are these sheets made of? The Serta® Perfect Sleeper® Ultimate Microfiber Sheet Set sheets are made of 100% polyester microfiber. The yarns are double brushed for extra softness. Are the sheets machine washable? Yes, this sheet set is machine washable. Machine wash cold. Gentle cycle, with like colors only. Non-chlorine. Bleach only when needed. Tumble dry low. Do not iron.