The Light Blue fitted sheet is made to fit a standard size 28 inch x 52 inch crib mattress. 9 inch deep gusset works well with all mattress types. Elastic all around makes for a secure fit. Form fitted with contoured corners to keep sheet snug and smooth. It is made of 220 thread count, 100% cotton percale. Care instructions: machine wash cold with like colors in gentle cycle with mild detergent, do NOT bleach, tumble dry low.