For maximum motion control, count on the Apex Boss Runner ’10 shoe. Formerly an AEtrex style, this women’s running shoe features a breathable air mesh upper and a molded, external heel counter for support and rearfoot control. The Contrex external stability enhancer controls pronation in combination with the supportive Carboplast footbridge that provides further motion control and minimizes mild over-pronation. You can personalize the fit of the Apex Boss Runner ’10 athletic shoe with Mozaic Customization technology. Includes two removable inserts.