The Patagonia Nano Puff Insulated Jacket is the piece that earns a permanent spot in the pack because it weighs almost nothing and handles the temperature swings that define shoulder-season days: the cold morning start, the warm midday climb, the chill that returns at camp. The brick quilting pattern locks the PrimaLoft Gold Eco insulation in place so warmth stays even across the jacket rather than migrating to the seams. It layers cleanly under a shell without binding at the shoulders or bunching at the cuffs. What Our Gearhead(R) Experts Are Saying:"I've owned the same style of jacket for over a decade because the PrimaLoft Gold keeps me warm without the bulk that makes me leave a layer at home."