The High Seas Fitted Sheet is different than the sheet that comes in the set and gives your nursery a different look. It is made to fit a standard size 28 inch x 52 inch crib mattress. It has elastic all around for a snug fit. It is made of 100% cotton. Care instructions: machine wash cold in gentle cycle, use only NON-chlorine bleach when needed, tumble dry low, warm iron when needed.