Notch innersleeve construction for excellent fit and comfort. Highly ventilated quarter panels for breathability. Closed seam tip for durability. Lightweight, perforated design. Designed with natural motion principles for a greater range of foot motion. Nike Air-Sole unit in the heel for enhanced cushioning. Nike GDR rubber in the areas of highest wear for excellent durability. Unitsole midsole foam in low wear areas for reduced weight.