Made for alpine travel and mountain realities, the Arc'teryx Beta SL Jacket Men– the lightest Beta – is carefully designed to deliver complete waterproof, windproof, breathable protection without sacrificing features or packability. Its next-generation Gore-Tex ePE membrane is light, thin, strong, and PFC free. C-Knit backer technology improves comfort and breathability. The helmet-compatible StormHood protects without compromising vision, pit zippers ventilate, and a Recco reflector can aid in search situations.