The inside is made of warm fleece material. This is a used item worn by a child. Please refrain from purchasing if you are looking for perfection or are concerned about fine details. Children's clothes are quickly outgrown, and it's a shame to let them go to waste, so I'm selling them at a low price hoping someone else will wear them!! Please understand that there may be overlooked minor details such as small, unremovable pills, stains, surface fuzz, and small dust particles that are not easily visible before purchasing. *I'm organizing clothes, and I plan to list many other children's clothes and shoes. If you want to buy in bulk, please comment. Please take a look!!!