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Nike "Free Flex" Concept.. a future generation of the Free Run+ barefoot running shoe. Extremely lightweight, flexible, and comes in various stiffness and support levels. The future of barefoot running; Very breathable due to little surface area, upper is made out of rubber and reaches down to the outsole in one piece, durometer of the rubber varies the stiffness of the shoe. Outsole tread has two pads for the ball of the foot and for the heel.. surrounded by fin like tread to give a good gripping surface and for the runner to feel the road.