Under Armour Team Speedform Gemini Synthetic Rubber sole Charged Cushioning delivers impact protection, energy return & adaptive support. Ultrasonic welded seams stay close to the skin for added support & comfort. Moisture-wicking sockliner built right into the midsole, adding even more cushioning & seamless comfort. Blown rubber outsole with carbon rubber heel is light-weight but incredibly durable. Anatomically placed flex grooves allow an optimal heel-to-toe transition for a smoother ride.