What Our Gearhead(R) Experts Are Saying:"This jacket is overbuilt in all the right ways. I wore it during a sub-zero basecamp stay and barely noticed the wind. The box-wall construction and wired hood trap heat where it matters, and every feature-from the mitt-friendly cuffs to the oversized zips-feels expedition-ready."When we push into the most inhospitable corners of the planet-high on an 8000-meter ridge or across polar terrain-the gear we carry has to deliver. The Expedition 8000 Jacket from Rab is designed with one mission: to keep us warm and functional in the world's harshest conditions. Insulated with 850-fill European goose down treated with a Nikwax hydrophobic finish, this is the warmest jacket in Rab's lineup, built for performance at the coldest extremes. Its Pertex(R) Quantum Pro outer shell resists snow, wind, and abrasion, while the Pertex(R) Quantum lining boosts warmth retention and loft. The box-wall baffle design and differential cut ensure insulation stays lofty and thermal bridges are eliminated. It features a helmet-compatible hood, side vent zips for dumping heat on the move, and articulated elbows that maintain mobility under layers. Oversized mitt-friendly zippers, storm flaps, and reflective accents round out this specialized piece. This is not just a jacket-it's essential shelter for the summit.