The Insulator PerformX Tights use WarmStretch™ temperature-regulation fabric to maintain a constant comfortable surface temperature in a variety of conditions — perfect for the cold weather athlete. The PerformX line of tights keep everything in correct alignment for optimum balance, efficiency and power by providing support for the IT band, hip flexors and quads as well as good stabilization of the knees, calves and Achilles. The patented CW-X Support Web™ acts as a suspension system for the quadriceps, increasing power at the push phase of the running motion. Variable compression facilitates circulation during and after activity, minimizing lactic acid build-up so that you can be active longer and recover faster.