"What Our Gearhead® Experts Are Saying: ""I reach for this jacket when I want serious warmth without bulk. The 800-fill ProDown is impressively efficient, and the slim cut layers cleanly under a shell or works great on its own. It packs down tiny, moves well while hiking or skinning, and feels purpose-built for cold days where weight and mobility matter."" We turn to the Summit Breithorn Jacket when lightweight warmth and performance are non-negotiable. Built by The North Face as part of the Summit Series, this jacket is designed to thrive in cold, demanding environments—whether we’re moving fast in the mountains or layering up for crisp winter days closer to home. High-loft 800-fill ProDown delivers exceptional warmth for its weight, while a recycled nylon ripstop shell with a DWR finish helps fend off light snow and moisture. Raglan sleeves and underarm gussets keep movement unrestricted, and stretch-knit cuffs with FlashDry enhance comfort during high-output efforts. With multiple internal storage options and the ability to pack into its own pocket, the Summit Breithorn Jacket is a technical layer we trust when conditions turn serious."