The Saucony PowerGrid Cortana features a 4mm midsole offset PowerGrid EVA that provides responsiveness and cushioning. Built-in medial post gives the shoe added support. Sauc-fit is a unique fit system in the upper that not only locks the midfoot onto the platform but also keeps the heel secure and comfortable. Engineered Air-mesh provides lightweight breathability. Hydrator Collar Lining protects and provides next-to-skin comfort to maximize wicking. HRC® Strobel Board increases cushioning and step-in comfort. Powergrid combines Saucony's new and innovative PowerFoam with their industry acclaimed Grid™ technology to create Powergrid™ that provides the runner with superior cushioning and responsiveness on every run. Impact Interface cushions and isolates heel impact. SRC Impact Zone™ provides shock attenuation and sets the foot up for a smooth transition. IBR is Saucony's new blown rubber compound that is lighter, more responsive and has enhanced cushioning and durability properties. XT-900™carbon rubber outsole offers exceptional traction properties without sacrificing durability. Wt. 8.6 oz.