Thera-Temp® wraps use therapeutic, non-organic mineral beads which collect and hold moisture from humidity in the air. Thera-Temp® wraps are superior to other wraps made with flax seed or rice. Because Polar's Thera-Temp wraps are made with non-organic beads, they will never break down, decay, or develop an odor! Wraps are designed with soft, luxurious fleece on the side nearest the skin and an insulated fabric with vapor barrier on the outside to direct the moisture and heat toward the body.