S-4 DThe S 4 D is designed for resort skiing and cold weather mountain activities, built to deliver warmth and reliable protection in low temperatures. This Gore Tex down jacket uses a 2 layer ripstop shell for waterproof, windproof, and breathable coverage. RDS certified down insulation provides efficient thermal comfort, reducing the need for heavy layering on frigid mornings. The internal down collar traps heat at the neck, helping retain warmth