Craft Felt. There are 4 types of felt you may encounter. Craft felt, Eco-Friendly Felt, Blended Wool, and Wool felt. Craft felt is100% synthetic, man-made felt. Craft felt is mainly acrylic, polyester, rayon, or a rayon blend. It tends to be "hairier" therefore works the best when you want to adhere to another felt piece using only static friction!