What Our Gearhead(R) Experts Are Saying:"This jacket is in my pack year-round. It's breathable enough for moving fast on the skintrack and warm enough to wear around camp. I also appreciate the sleek fit-great for layering under a shell without bulk."We count on the Vesper Insulated Jacket when our days demand breathable warmth that doesn't weigh us down. Outdoor Research built this piece with bluesign(R) approved materials and VerticalX(TM) Eco SR insulation to deliver all-conditions comfort with sustainable performance. Whether we're setting out on a pre-dawn start or navigating variable alpine weather, this lightweight jacket keeps our core warm and our movements unrestricted. Ultralight ripstop fabric resists wind and water while staying flexible, and stretch-bound cuffs with an adjustable hem seal in the heat. The fit is trim and layer-ready, and when we don't need it, the whole thing packs into its own pocket. With just the right blend of warmth, weather protection, and packability, the Vesper is a year-round essential.