The CW-X Insulator StabilyX Tight uses Auto-Sensor® nanotechnology fabric to maintain a constant comfortable surface temperature in a variety of conditions. Perfect for the cold weather athlete. Patented CW-X Support Web™ bands together the muscles and ligaments of the leg to stabilize the knee and reduce vibration for increased efficiency. The CW-X Support Web™ also harnesses the midsection, supporting the lower abdominals, hips and back to channel power through the core. Variable compression facilitates circulation during and after activity, minimizing lactic acid build-up so that you can be active longer and recover faster. Auto-Sensor® 80% polyester/20% polyurethane spandex. Imported.