The inside is cotton. Its not fiberfill like stuff. You can tell it’s older because of the way it feels so worn and soft. This was given to my grandmother many years ago by some friends that actually made the quilt. My mother thinks it’s over 100 years old. My mother is 75 and she said the ladies that made that quilt were in their 60s when she was a little girl. My granny had this for a long time before giving to my mother.