Ryka designed this to be one of the most comfortable training shoes ever tried. A breathable upper provides lightweight support while our proprietary RE-ZORB® cushioning technology provides superior impact protection and comfort. The lightweight, durable mesh upper and direct fuse synthetic provides lightweight support in midfoot and heel. Features additional support with internal synthetic structure to keep her foot in place. Compression molded EVA midsole features an internal RE-ZORB®® insert along the entire length of the foot. Additional PU heel pad for even greater comfort and cushioning. Rubber outsole provides traction on a variety of surfaces.