Whether you run the slick rock of Moab or train on the streets for the Boston Marathon, the Nike Structure Triax X can add extra support and pronation protection. With a new soft Riderline footbed, Fitsole sock liner and updated last, the Structure Triax X raised its own bar as a women's running shoe dedicated to high-performance comfort. Enhanced with the heel Air-Sole and forefoot Zoom Air unit package, the Nike Structure Triax X provides excellent shock absorption and cushioning while minimizing foot fatigue. Add the highly breathable sandwich mesh upper with supportive overlay and you've got a cool comfortable fit made for the long haul.