Weighing less than many base layers this down jacket is astonishingly light given the warmth, which is the same as other jackets weighing well over twice as much. The low weight is due to the high fillpower down, the thin shell fabric and Berghaus’s body-mapping construction. The last means there’s more down over the core as that’s where warmth is most needed with less on the shoulders and upper arms and even less again on the sides and under the arms. There’s no hood but the high collar is snug. The pockets lie above a hipbelt. I’ve found the Ramche Hyper warm on sub-zero nights in camp worn over a thin fleece. Berghaus says it’s a ‘highly technical down climbing garment’. I think it’s ideal for backpacking.