The Nautical Nights Twin Sheet Set includes a twin fitted sheet, twin flat sheet, and 1 pillow case. The sheets fit a standard size, 39 inch x 75 inch twin mattress. The pillow case is designed to hold a standard size, 20 inch x 26 inch pillow. They are made of 100% cotton. Care instructions: machine wash cold with like colors in a gentle cycle, do NOT bleach, tumble dry low and remove promptly, and iron on lowest setting as needed.