The Patagonia R1 Ultralight Hoodie is the midlayer that disappears under a shell, slim enough to layer without bunching at the shoulders and light enough to forget it's in the pack until the temperature drops. The flat-faced double knit sits close to the body and moves with a climbing sequence or a skintrack without pulling at the seams, and the fixed hood tucks cleanly under a helmet without adding bulk at the collar. What Our Gearhead(R) Experts Are Saying:"I pack this when every ounce counts because it adds a full hood and chest pockets without changing how the pack feels on my back."