Scarpa's Men's Phantom Tech Mountaineering Boots may be built like a brick house, but they're about 20% lighter than traditional leather cold weather mountaineering boots, making them a solid choice for everything from standard mountaineering to hardcore ice climbing. 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.A new addition to the Phantom Tech is Scarpa's flex seal gaiter with a spiraling zipper closure that helps eliminate stress points as the boot flexes forward, making the Phantom more comfortable when hiking and climbing. Beneath the burly waterproof gaiter lies a Primaloft insulated boot with carbon fiber insole and EVA cushioning for support on terrain steep and moderate. A microporous 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. The Phantom Tech is also compatible with automatic and semi-automatic crampons, so you can enjoy extra grip whether you're traveling across glaciers or front-pointing up ice.