The Scarpa Phantom 8000 Thermic HD boots are engineered for the harshest high-altitude conditions. They feature an integrated heating system, extensive insulation, and a double-boot design with insulated gaiter, boot, inner boot, footbed, and heated insole. The waterproof gaiter uses S-Tech Schoeller Ecorepel Bio fabric and a YKK Flex Seal zipper. Durable polyurethane rand protects against abrasion. A Vibram Newflex outsole ensures grip on ice and snow, while the EVA midsole provides shock absorption.