French terry and sweatshirt knit are two favorites. French terry has lots of loops on one side - on the back. Out of the many types of french terry material Bamboo french terry is the softest. Apparel Polar fleece - This has a fleeced side and a normal ribbed polyester side. Elastic flannel has raised a nap on the face. If you are ok with thin sweatshirts, you can use cotton jersey knits. You can also use Jersey (polyester and cotton blend) and Triblend jersey (polyester, cotton, and rayon)