Developed with the maximum degree of pronation-control the Nike Air Structure Triax IX features exceptional cushion and support for female runners seeking extra stability correction and protection. It's reinforced with a support overlays along the upper that reinforce without compromising the flex in your natural stride. Mesh fabric throughout the upper enhances vapor transfer better than some pronation-control shoes that opt for stifling construction throughout the upper. Inside the Nike Air Structure Triax IX has a dual-density footbridge along the midsole to enhance pronation control in conjunction with a soft polyurethane crash pad. A dual-pressure Air-Sole unit in the heel and Nike W.A.R.P. Tech along the forefoot completes the stability package. Other performance refinements include a forefoot Air-Sole unit to disperse pressure at toe-off and a midfoot shank for midstance support. Beneath it all is a tri-zone outsole for enhanced traction comfort and control through transition. If you've been hampered by pronation-related injuries or you're looking for a way to minimize your exposure to injury potential picking up the control features in Nike's Air Structure Triax IX is a big step in the right direction.