The Dual Fusion TR sneakers by Nike are ideal for the female athlete who wants a lightweight, versatile, no-distractions training shoe for indoors or outdoors. Imported. Upper: Mesh paired with thin layers of TPU are placed in specific zones for support while you train. Midsole: Dual Fusion technology specific to training. Firmer foam wraps along the edge of the midsole for stability as soft foam runs under footbed for maximum comfort. Outsole: Durable rubber outsole provides protection and traction for all indoor and outdoor training.