The Nike ACG Therma-FIT ADV Lava Flow Jacket was tested on a canoeing trip through Big Bend National Park, which means it's proven itself against serious cold desert nights and actual adventure conditions. PrimaLoft insulation fights off the chill while that water-repellent finish keeps you dry, and the whole jacket packs into its own internal pocket so you're not carrying dead weight when the day warms up—just clip it to your pack with the ACG carabiner and keep moving.