Under Armour Men's UA SpeedForm XC Mid Trail Running Shoes Synthetic-and-mesh UA Storm technology repels water without sacrificing breathability or adding weight Innovative UA SpeedForm technology delivers zero distraction while running Seamless heel cup with silicone grip for a locked-in, anatomical fit TPU heel counter adds structure for greater stability Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort