NIKE Mens Air Zoom Terra Kiger 2 Trail Running Shoes Purple/Black Dynamic Fit technology integrates Flywire cables with the laces for an adaptive, supportive fit Recycled no-sew overlays for targeted support and stitch-free comfort Perforated foam on the tongue and collar molds to the foot and increases airflow Single-layer engineered mesh on the toe box delivers lightweight breathability and comfort. The updated midsole features a slightly firmer compression molded foam for greater response on and off the trails. Nike Air Zoom units in the heel and forefoot add even more responsive cushioning and a low-profile feel.