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The Nike Free Train Force Flyknit Men's Training Shoe is as dynamic as your workout, combining the second-skin fit of Nike Flyknit with a revolutionary Nike Free outsole that expands and contracts with your foot on every landing. A Flyknit upper hugs your foot for a locked-in feel and lightweight, breathable support that moves with you during your workout. The shoe's unique dual-density midsole provides the cushioning you need for varied cardio workouts along with the stability required for lifting. With each stride, the updated Nike Free outsole's unique tri-star structure expands and contracts in all directions, following the natural motion of your foot.