Ankle Support (Special), Per Pcnano bamboo charcoal supports to emit 85 95% Far Infrared Rays, increasing blood circulation around the knee joint during activities and promote the body's nature healing process the special polyester fabric designed (cross ("+") profile) with function of absorb perspiration and moisture on the skin release Negative Ions, keeping air clean, odor free, encourage the body cellars growth good effects for the power of resistance strengthen our metabolism