Women's Nike Free TR 6 Spectrum Training Shoe DYNAMIC FIT WITH A FLEXIBLE FOUNDATION. Lightweight, breathable mesh and dynamic Flywire cables make Women's Nike Free TR 6 Training Shoe the perfect workout companion. Its tri-star outsole pattern adjusts to your foot's every step, delivering both support and flexibility. Strong, lightweight mesh upper offers support and breathability. Flywire cables asymmetrically wrap the forefoot for a stable, locked-down feel. Outsole pattern expands and contracts to disperse pressure equally. Outrigger helps aide stabilization during lateral movements. Flex grooves are cut into the outsole for natural flexibility.