The Arc'teryx Women's Atom LT Vest is a versatile and lightweight sleeveless windproof thermal vest that is perfect for active pursuits. It is made from durable and breathable Tyono 20 fabric with a DWR (durable water repellent) finish, making it windproof and water-resistant. The vest is insulated with Coreloft synthetic insulation, providing excellent warmth even in wet conditions. It features a low-profile collar, zippered hand pockets, and an adjustable hem drawcord for a customizable fit. The Atom LT Vest is also highly compressible and can be easily packed into its own pocket, making it convenient for travel or layering. With its superior performance and sleek design, it is no surprise that this vest is one of the most wished-for items on Amazon.