Down jacket derived from the Tsurugi Jacket, which has a 10-year history. More than a decade ago, a world-renowned ice climber who was formerly in the NATO mountain troops, and a gentleman who was in the SAS and devoted to critical mountain expeditions, started the "Mountain Project" with the aim of developing systematically wearable clothing, from base layers to shells and over jackets. The main shell of that project is the current "Tsurugi Jacket." The ventilation system common to all is arranged from the system and angle of the TB Jacket & Pant. The Tsurugi 10th Down Jacket has been brushed up with the shape of the insulation made for relatively low-temperature situations, and is filled with 850 fill power down with water-repellent treatment. Length 78 / Width 62 / Sleeve Length 94