Under Armour SpeedForm Apollo Vent Running Shoes Synthetic-and-mesh Innovative UA Speedform Technology - Delivers zero distraction while running. Seamless Heel Cup with Silicone Grip - For a locked-in, anatomical fit. ArmourVent Mesh Upper - Delivers true breathability in a light, stretchy, durable, fast-drying fabric. Smooth, Ultrasonic Welded Seaming - With Bemis tape for next-to-skin support and comfort. Molded 4D Foam Footbed - Conforms to your foot's exact shape, eliminating slippage.