Primeknit naturally expands with your foot for a more comfortable fit and reduced irritation The midsole boost™'s ensures energy-returning properties to keep every step charged with light, fast energy TORSION® SYSTEM delivers midfoot integrity Ergonomic heel structure for added support STRETCHWEB rubber outsole is lightweight and elastic, adapting to the ground for stability and combines with boost™ Continental™ Rubber outsole for extraordinary grip in both wet and dry conditions The Ultra Boost ST Women's Running Shoe from adidas is at the vanguard of their running footwear. It's a lightweight, cushioned stability running shoe built for your pace and any distance from a training run to a full-length marathon. Offering the ultimate experience in luxurious stability, the Ultra Boost ST has a plush boost™ midsole that keeps every step charged with energy. An adaptive adidas Primeknit upper and ergonomic heel give lightweight support exactly where it's needed, and a STRETCHWEB outsole provides a smooth, stable heel-to-toe transition.
