Light, packable all-mountain GORE-TEX ePE shell with an extensive feature set.*The Beta SL Jacket was previously the Beta Lightweight Jacket. Made for alpine travel and mountain realities, the Beta SL Jacket - our 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.