The North Face Summit Nuptse Jacket pairs RDS-certified 800-fill-power ProDown through the body with a separate Heatseeker synthetic draft flap along the zipper, so the warmth-to-weight advantage of down stays intact while the fabric most exposed to moisture gets built to handle it. Targeted panels of Spectra ripstop reinforce the yoke, collar, and hood exactly where a pack strap or climbing helmet creates the most wear. A non-PFC DWR finish across the recycled nylon shell adds water repellency without relying on the chemicals older durable-water-repellent finishes used. What Our Gearhead(R) Experts Are Saying:"I got caught in wet snow above treeline and the down never packed down flat the way I've seen other jackets do. The zipper stayed dry against my chin the whole descent, even where the draft flap usually soaks through first."