Our soft organic cotton stars knit is grown and sewn right here in the U.S. No chemicals in our manufacturing facility at all. Elastic all around for safety. This fits the Da Vinci mini and other items ranging from 36-38" by 23-24". We make with a fabric covered elastic band all the way around the bottom for a snug fit; very smooth against your baby's delicate skin. It is a good idea to buy at least two sheets so you have a fresh sheet while the other is in the wash.