Your baby will sleep like a dream on soft and cuddly 100% cotton flannel. The finished elasticized edges will ensure the sheet lasts through lots of washes and the 9 ½" (24 cms) gusset provides a safe snug fit with any crib mattress. Machine washable in warm water and low tumble dry. Fits standard size crib mattresses 28" x 52" (71 x 132 cms).