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When you’re in motion – climbing, hiking – regulating thermal comfort is essential. Made to balance air flow and insulation, the Proton Lightweight Vest wraps the core to deliver warmth without overheating. The Fortius Air 20 outer stretches and balances moderate wind and weather protection with airflow. Octa Loft knit insulation provides warmth that resists packing out over time. The chest pocket and hand pockets provide secure storage, and the trim fit layers easily under a shell.
