The Jr. Varsity Fitted Sheet is different from the sheet that comes in the set, and gives your nursery a different look. It is designed to fit a standard size, 28 inch x 52 inch crib mattress. It is made of 65% polyester and 35% cotton. Care instructions: machine wash cold in gentle cycle, use only NON-chlorine bleach when needed, tumble dry low, warm iron as needed.