Nike Women"s Free TR Fit 3The Nike Free TR III Women?s Training Shoe improves on its predecessor to deliver greater comfort and closer-to-barefoot training. The updated design combines enhanced training-specific flexibility and traction with lighter weight and a more modern upper?ideal for training at the gym or with Nike Training Club.Flexibility Deep flex grooves promote natural movement for a more barefoot-like feel. The upper is made of thin, lightweight materials with minimal seams to enhance multidirectional flexibility for natural range of motion. Low-profile Comfort The low-profile design lets you feel closer to the ground, with a Phylite midsole that provides lightweight cushioning and enough durability to double as an outsole, dramatically reducing the overall weight of the shoe. Breathable Support Breathable foam in the upper and internal support straps in the lateral forefoot and medial arch offer training-specific support. Raised foam in the arch adds even more support where you need it. More Benefits Heel pocket accommodates a variety of heel shapes for a comfortable fit Training-specific traction pattern for multidirectional movement Rubber pods at the heel and forefoot for durability Sizing is measured in US