What Our Gearhead® Experts Are Saying:"This is the jacket I grab for the coldest missions—think subzero basecamps and exposed belays. The Positron Pro Hoodie traps heat incredibly well with 800-fill down and boxwall baffles that eliminate cold spots. It’s built to withstand harsh mountain environments without sacrificing mobility."When the wind cuts deep and the mercury drops well below freezing, we reach for the Positron Pro Hoodie. Built by Rab for high-altitude climbs, winter belays, and polar missions, this expedition-ready insulator wraps us in a fortress of 800-fill-power European goose down. Its boxwall construction maintains maximum loft, ensuring no heat escapes and no cold spots form—critical when conditions are unforgiving. A Pertex® Quantum Pro outer resists snow, spindrift, and abrasion, while articulated sleeves and zoned baffles under the arms and sides support a full range of motion without sacrificing warmth. The down-filled hood with a wired peak fits over a helmet for reliable shelter when storms roll in. With insulated chest and hand pockets, mesh stash pouches, and internal storage that doubles as a stuff sack, this jacket is engineered for the realities of alpine life. Whether we’re moving between camps or standing still on a frigid summit, the Positron Pro Hoody is our line of defense against the deep cold.