The Arc'teryx Women's Atom LT Vest is a high-performance sleeveless vest that is perfect for outdoor activities. It is made with a lightweight and breathable fabric that provides excellent insulation and moisture management. The vest features Coreloft synthetic insulation, which retains warmth even when wet. It has a slim fit and a low-profile collar for added comfort. With its durable construction and versatile design, this vest is a great addition to any outdoor wardrobe.