Felt Toys. Felt is a textile material that is produced by matting, condensing and pressing fibers together. Felt can be made of natural fibers such as wool or animal fur, or from synthetic fibers such as petroleum-based acrylic or acrylonitrile or wood pulp-based rayon. Blended fibers are also common. Reference: Wikipedia
In toy making the best felt is usually 100% wool felt which is thicker and more durable than synthetic felt.