If you couldn't tell just by looking at them, the Phantom 8000L HD is SCARPA's burliest mountaineering boot, made for climbers who live for expedition climbing and high-altitude mountaineering. Constructed in the classic double boot style, the Phantom features a 6-layer insulated shell that can handle long days in harsh mountain environments. A built-in, full-length gaiter, which is both waterproof and insulated, is larger than ever before for additional coverage. Inside you'll find a boot packed with insulation, so warm that it'll make your feet sweat just looking at it. Pair this with a lightweight Vibram outsole and you've got a boot that's ready to tackle an 8000-meter peak - or maybe all 14 of them.