The Outdoor Research Women's Helium II Vest is a top-rated sleeveless activewear vest on Amazon. It is designed for lightweight and packable protection against the elements. The vest is made of waterproof and breathable fabric that keeps you dry and comfortable in wet conditions. It features a full-zip front closure and a high collar for added protection against wind and rain. The vest also has zippered hand pockets for secure storage of small essentials. With its lightweight and compressible design, this vest can be easily packed into its own pocket and carried in your backpack. Whether you're hiking, backpacking, or traveling, this versatile vest is a must-have for any outdoor adventure.