The Astrarun ‘Black Blue’ rides on a lightweight midsole that combines two different cushioning technologies: Bounce for a flexible ride, plus adidas Boost for energy return and a responsive feel. Up top, a breathable mesh build hugs the foot for a supportive fit. The basic black finish is contrasted by floating white three-stripes and a pop of royal blue on the Fitcounter molded heel, which enables natural movement of the Achilles for unrestricted comfort.