Built and engineered at the request of the U. S. Navy Seals, the OTB Abyss takes on wet and dry terrain in the toughest conditions. Razor siping in the grippy, lugged sole and lots of drainage. The lugs and razor siping in the sole channel H2O away and greatly improve traction in wet conditions. Ballistic mesh in the upper and drain ports in the sole rapidly pass H2O away from your feet. The mesh and synthetic materials in the upper dry quickly for foot comfort and health. Rubber reinforcement in the toe and heel Safe guard against the rocks, roots and other outdoor obstacles. Cushioning foam in the upper will not absorb H2O. The unique three part insole system lets you adjust stiffness and fit, while letting H2O drain through the sole ports.