A waterproof down jacket, Mizusawa Down Jacket Shuttle. Traditional down jackets have a few weaknesses; warmth cannot be maintained because they are weak against rain and snow, for instance, water gets in through the line of stitching and the feathers get wet and; the down falls easily through the gap of the stitches. This Mizusawa Down is a revolutionary down jacket, which you can wear on a rainy or snowy day because it has no stitches in its down packs and is impervious to water, using thermocompression bonding thanks to high domestic technologies. The needle stitched parts have thermal adhesion processing, and the parts that require sewing have seam tape processing, which enables unprecedented "water resistance."