rehband rx knee support - 3mm - black/pink - medium - 1 sleeve rehband the construction of the bandage is based on a unique patent to ensure the anatomical fit. this shape allows the product to follow the body's movements. the bandage causes the body to automatically execute the movements correctly, without preventing the wakings of the muscles. the rehband rx bandage is classified as a medical device. it combines the most important benefits: stability, compression and warmth.