There's no question that shoe technology keeps evolving — ever since some genius thought to add pumps to a pair of kicks, we haven't looked back. The Adidas Springblade ($180) may represent the next critical step in that evolution. Each pair features 16 downward-angled blades in the midsoles that react to your movement and the pavement, springing you off the ground with each step. Couple that with a better fit on the top of the foot and improved temperature resistance, and your old running shoes may be relegated to the back of your closet. Available in August.