What Our Gearhead(R) Experts Are Saying:"I stuffed this into the top of my pack on a high alpine backpacking trip and barely noticed it was there until I needed it at camp. The synthetic panels under the arms meant I didn't have to strip it off during the short bursts of climbing on the approach."A jacket meant to travel with you into the high alpine has to earn its spot in the pack, and the HIMALI Accelerator Down Jacket does exactly that. Toss it in before a ski tour or a summer trip above treeline, and the compressed size barely registers against your gear, ready to shake out the moment the sun drops or the wind picks up on a ridge. Inside a 20D Pertex(R) Quantum shell, roughly 4 ounces of 850 fill power down deliver warmth without adding real weight, while synthetic insulation mapped at the underarms and mouth guard keeps you from overheating during the sweatier stretches of a climb. An athletic, articulated fit is cut to layer cleanly over a base layer, so the down works efficiently instead of heating dead air, and hood and hem drawcords seal out drafts the moment you stop moving.