NIKE Free Train Instinct Cross Training Shoes Synthetic DYNAMIC STRENGTH The breathable warp knit upper offers multidirectional stretch and incredible durability, letting you move freely and confidently during tough workouts. STABLE CUSHIONING The shoe's unique dual-density midsole provides the cushioning you need for cardio workouts along with the stability required for lifting. DYNAMIC MOVEMENT 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. Flexible collar creates offers stability and support at the ankle Knit outrigger in the forefoot gives you lateral stability as you cut