Synthetic sole. Innovative UA SpeedForm technology - Delivers zero distraction while running. Smooth, ultrasonic welded seaming with Bemis tape - For next-to-skin support and comfort. Perforated upper with ultrasonic seal - For durable breathability. Molded toe cap - For added support and durability. Embedded sockliner within cavity of midsole - For added cushioning, moisture wicking and seamless comfort.