1. To achieve the core requirement of "lightweight and portable," the lightweight outdoor down jacket fabric uses high-density ultra-thin fibers and undergoes high-tech nano-triple protection treatment: waterproof, stain-resistant, and down-proof. It not only blocks external moisture from entering but also quickly wicks away sweat vapor, keeping the skin dry and preventing cold discomfort caused by sweat buildup. 2. The lining uses 400-strand (400T) ultra-soft washed lining fabric, which is breathable without shrinking, has a soft and smooth feel, and offers superior down-proof performance compared to ordinary down-proof lining fabrics. 3. Down filling: Uses Samsung Group's safe down, which has high loft and a higher down content than ordinary down, ensuring warmth from the core filling layer and making it more reliable. 4. The wind speed inside the fabric is only 12% of that on the outside, combined with the fluffy, heat-locking layer of the down, avoiding the problem of traditional down jackets being "breathable in a breeze."