Airflex is extremely breathable material for cool comfort during active use. It is specifically designed for air circulation, heat transfer and moisture wicking away from the body. Any activity where excess heat or perspiration could be felt under the brace is an ideal application for this product. Additionally, it is stretchy and smooth for the highest level of comfort. The Ortho Active Airflex Hinged Knee Support is designed to provide medial and lateral support to the knee without the extra bulk. The compression sleeve and side stays provide knee stability, and the hinges may be removed and molded to the leg to provide a custom fit.