The Patagonia Women's Down Sweater Vest is a popular choice for women's thermal activewear. This vest is made from 100% recycled polyester, offering both warmth and sustainability. It features 800-fill power down insulation, providing excellent warmth in cold conditions. The vest also has a durable water-repellent finish, making it suitable for various outdoor activities. With its eco-friendly materials and reliable performance, it's no surprise that this vest is a top seller on Amazon.