adidas Springblade Running Shoes techfit - Delivers natural, flexible upper support with a seamless fit that significantly reduces the risk of chafing, blistering and overall discomfort. Air Mesh Upper - Allows air to fully permeate the shoe, thereby encouraging an environment that is cooler, drier and altogether more pleasant. Textile Lining - Sits comfortably against the skin for a softer, more enjoyable ride. External Heel Counter - Holds the heel firmly in place for a secure lockdown that doesn't allow the foot to move detrimentally inside the shoe. 16 Polymer Blade Outsole - Each individual blade is angled and appointed to absorb impact from the initial heelstrike and transform this energy into an explosive toe off as the foot transitions through each subsequent phase of the gait.