Scarpa Men's Phantom Tech Mountaineering Boots are about 20% lighter than traditional leather cold weather mountaineering boots. It may be built like a brick house, making it a solid choice for everything from standard mountaineering to hardcore ice climbing. This is made with the same material as Scarpa's Himalayan boot. The Phantom Tech has a special OutDry membrane that's laminated to a combination of Schoeller K-Tech, S-Tech, and Super Fabric, making them about as burly and waterproof as any cold weather mountaineering boot on the market. Exceptional ice-climbing performance is finished off with a purpose-designed Flexseal zipper® closure to keep in your hard-earned warmth. A micro porous EVA midsole adds gently cushioning to the boot without interfering with their overall feel, while a lightweight Vibram Zero Gravity provides a durable yet light sole to the boot.