Ultralight, Packable Protection for Unpredictable Weather The Helium UL Jacket is built for fast-moving pursuits in unpredictable weather, delivering ultralight, waterproof, and windproof protection for hiking, trail running, and travel. Made with Toray Dermizax 2.75-layer fabric and fully seam-taped construction, this jacket provides ultralight, reliable waterproof performance and breathable comfort during high-output activity in unpredictable weather. An adjustable hood with a brim wire offers dependable coverage, while YKK Aquaguard zippers and shaped, bonded cuffs with partial elastic seal out the elements. Reflective logos improve low-light visibility, and the chest pocket doubles as a stuff sack for easy, compact storage on the go.