Synthetic, single layer air mesh upper for breathability and water capability. Lycra® neoprene lining for comfort and improved ventilation. Perforated EVA removable footbed provides moisture control. Merrell In-Board™ Compression Molded EVA footframe for increased support. Merrell air cushion in the heel provides shock absorbency and cushioning. Molded nylon arch shank for increased support. 3.5mm sole lug depth. M Select WET GRIP non marking sole is water friendly. Vegan friendly.