Stay warm. Stay focused. The Nuclei SV – our warmest synthetically insulated belay parka – delivers outstanding thermal performance. Varied layers of Coreloft™ insulation are strategically placed to combine maximum warmth with lightweight packability, and the ultralight, ultra-durable Hadron LCP shell is windproof and water resistant. Three external and two internal pockets keep essentials at hand, and the helmet-compatible StormHood protects without impeding vision.