Under Armour Women's SpeedForm XC Running Shoes Synthetic-and-mesh nnovative UA SpeedForm technology delivers zero distraction while running Seamless heel cup with silicone grip for a locked-in, anatomical fit TPU heel counter adds stability without piling on weight Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort Micro-perforated upper with ultrasonic seal for durable breathability