Alaska, Aconcagua, and the Canadian Rockies in winter...lighten up a couple hundred grams from the 8000, but take all the high-altitude burl with you in the Phantom 6000.
Same Schoeller, Kevlar, and Cordura outer material with Outdry for weatherproof durability. Stay dry behind a Flexseal waterproof closure.
Hoard your heat with the felt and 4mm-EVA inner boot. Don't even consider a sloppy fit, either: this boot uses a quick-lacing system with Dyneema cord for strength and a progressive fit. Climb steep water ice, slog snowy ridges, and walk in comfort.
The Phantom 6000 delivers the comfort and climbing performance of a leather boot, but the warmth and multi-day versatility of a double boot. Go big!