NIKE Lady Free TR Fit 3 Cross Training Shoes Synthetic No-Sew Construction - At upper to minimize seams for less irritation, meaning you can concentrate on your workout. Air Mesh Upper - For maximum breathability, keeping your feet cool and dry. Phylite Midsole - With engineered longitudinal and latitudinal sipes for a much better and effective running experience Deep Flex Grooves - Located along the outsole for greater flexibility, smoother and efficient ride. Flexible Neoprene Heel Counter - That supports the foot and keeps it in place.