Scarpa's Men's Phantom Tech Mountaineering Boot is a solid choice for everything from standard mountaineering to hardcore ice climbing. It has a waterproof, breathable HDry membrane that's laminated to a combination of PU Tek and S-Tech fabrics, making it 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 its overall feel, while a lightweight Vibram Precision Tech Roll 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.