What Our Gearhead(R) Experts Are Saying:"The Deploy 3L Shell is my emergency layer that actually earns a permanent spot in my pack. It's featherlight, totally waterproof, and packs down small enough to disappear until I need it. Whether it's mountain running, ridge scrambles, or fast alpine days, it's the perfect mix of weight savings and real protection."We rely on the Black Diamond Deploy 3L Shell Jacket when every gram matters but protection can't be compromised. Designed for fast-moving missions in unpredictable weather, this ultralight shell delivers waterproof, breathable performance in a minimalist, highly packable design. The BD. dry(TM) 3L construction offers 20,000mm waterproofing and 30,000g/m^2/24hr breathability to seal out mountain storms while venting excess heat during high-output efforts. Its 10D mechanical stretch fabric feels barely there yet stands up to alpine exposure, while the single-adjust hood and elastic cuffs create a secure, streamlined fit. With two concealed hand pockets and an internal stash pocket, the Deploy keeps essentials close without adding bulk. Built for runners, climbers, and light-and-fast alpinists, this shell proves that ultralight doesn't mean unprepared.