Serious cold requires serious warmth. Packable, light, and efficient, the Nuclei SV is our warmest synthetically insulated belay parka. Varying layers of Coreloft are strategically placed to provide maximum insulation while keeping weight down, and the light, windproof, highly durable Hadron LCP shell has an acrylic coating for enduring water resistance. Three external and two internal pockets keep essentials at hand, and the helmet-compatible StormHood protects without impeding vision.

Updated with a dope-dyed Hadron® LCP (Liquid Crystal Polymer) outer with an acrylic coating for improved durability and water-resistance and a breathable 20D liner made from 100% recycled materials.