Polyurethane sole Engineered for agile and stable missions, the Zephyr MK2 GTX HI boasts a hi-cut upper crafted from water-resistant suede and breathable CORDURA, adjustable laces, GORE-TEX Extended Comfort lining for moderate or wet conditions, and a dual-layer PU midsole with MONOWRAP support. Approved as occupational footwear, it's built to excel in the field.