Tested and proven for durably waterproof, windproof, & breathable performance, GORE-TEX Invisible Fit is a lightweight, waterproof upper backed by the GORE-TEX GUARANTEED TO KEEP YOU DRY promise. Vibram Megagrip is a high-performance sticky rubber that offers unparalleled grip on both wet and dry surfaces, rugged longevity, and optimal ground adaptability. With Altra’s signature FootShape fit, you get our roomiest toe box with plenty of room to help your toes move freely, and space through the midfoot.