Outdoor Research Helium Rain Jacket

A 2.5-layer Pertex Shield Diamond Fuse shell that stays fully waterproof through a multi-day storm while folding down to fist size in the pack. At 5.5 oz the Helium rides light enough for thru-hikers who keep a hard shell for real rain and stash a wind shell for everything else, and the single-pull hood pulls cleanly under a climbing helmet. The Diamond Fuse fabric resists abrasion better than the typical 2.5-layer so the jacket survives bushwhacking and off-trail days without picking up tears.