When a fast-moving storm rolls in on the trail, the Helium is our go-to emergency layer for trail runners and thru-hikers who can't afford the weight. Diamond Fuse fabric is five times more tear-resistant than older versions while staying ultralight, and Pertex Shield construction keeps you dry without trapping heat. The whole jacket stuffs into its own chest pocket — carabiner loop included. Pertex Shield 2.5-layer construction is fully seam-taped and waterproof, with enough breathability to handle high-output movement in Southern heat and humidity Diamond Fuse technology delivers five times the tear resistance of previous generations — handles snags and brush without adding meaningful weight Stuffs into its own chest pocket with a carabiner loop, so it rides on a harness or disappears in a pack until you actually need it YKK AquaGuard water-resistant center zipper and an adjustable hood with bonded brim keep rain off your face during active use Reflective logos and forearm overlays add low-light visibility for early-morning or late-evening runs — a small detail that matters on busy trails
