Berber fleece is made when the yarn is knitted into fabric, which is brushed with wire brushes to pull the material together and to fluff it up. The resulting material has a looped, soft pile, with large air pockets, which improve the insulating properties of the fabric. The pile is sheared to create an even length. Synthetic materials such as polyester are most frequently used to create Berber fleece, which tends to be strong, stretchy, and colorfast. In addition to being warm, Berber fleece is also designed to wick moisture away from the surface of the wearer. It will also not absorb moisture as readily as some natural fibers, since synthetics are water resistant. Berber fleece is a fabric that is very lightweight, warm, and soft. It is often compared to fur, because of the incredibly soft texture it has.