Featuring an offset zip closure and built with the best materials available, the Phantom 8000L is our warmest climbing boot, offering technical climbing performance and serious comfort—the gold standard on cold, high-altitude peaks the world over. The gaiter, inner shell and removable inner boot combine 17 total layers of technology to deliver an amazing blend of warmth and high-altitude performance. The gaiter of the 8000L has been re-engineered to accommodate the extra volume required for use with down suits. Whether it’s a winter expedition in Alaska, or a trip to the Himalaya, when your objective involves serious cold or extreme altitude, the Phantom 8000L is the choice for you.