2XU Aero Mid-Rise Compression Tights Women's Black Reflective UK LARGE ONLYDesigned to alleviate overheating whilst running, the Aero Compression Tights feature innovative HeiQ Smart Temp technology that dynamically responds to body heat to keep you cool when your run heats up. Product details STAY COOL Innovative HeiQ Smart Temp technology senses any rise in body temperature, increasing the evaporation of perspiration through the fabric to keep you cooler for optimal performance. MULTIPLE POCKETS Mid Rise power mesh