Nike Free TR Fit III cross training shoes are lightweight and flexible enough for superior comfort during versatile workouts. A low profile and deep flex grooves encourage a more natural range of motion that provides a barefoot-like feel that helps to strengthen foot and leg muscles.Upper: A comfort tongue lays flat on top of the foot and uses layers of sandwich mesh to help reduce lace pressure for a comfortable fit. Mesh enhances breathability and flexibility. Midsole: A heel pocket accommodates a variety of heel shapes for a comfortable fit. Breathable foam and internal support straps in the lateral forefoot and medial arch offers training-specific support. The low-profile design lets you feel closer to the ground with a Phylite midsole that provides lightweight cushioning. Removable insole.Outsole: Rubber pods at the heel and forefoot increase durability. Deep flex grooves promote natural movement for a more barefoot-like feel. A training specific traction pattern enhances multidirectional movement. The Spring 2013 Sneaker Stars Shoe Guide in the April 2013 Fitness magazine names these shoes Best for the Gym for taking classes. "Perfect for switching quickly from exercise to exercise."Shape magazine gives these shoes the 2013 Shoe Award in the Cross-Training category for Best for Multitasking in the April 2013 edition. "The stretchy mesh upper cradles your arch to keep your foot stable."