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. * 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 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.