One of the main characteristics of stuffed animals is that they are soft to the touch. In addition to the material on the outside, the softness is due to the material used to stuff the toy. One of the main materials used to make teddy beards is cotton, a natural fabric you'll find in clothes and many household products, among other everyday items.
Another very common material used is wool, known to be quite fluffy. Other important materials include calico, velour, and polyester. The latter is a synthetic material that adds a certain texture to stuffed animals.