The Nike Women's Aeroloft Running Vest is a lightweight and breathable sleeveless vest that is designed for running in cold weather. It is made from a combination of polyester and nylon fabric, which provides excellent insulation and moisture-wicking properties. The vest features Aeroloft insulation, which provides warmth without adding bulk. It also has a full zip closure and a stand-up collar for added protection against the elements. The vest's slim fit and stretchy side panels allow for unrestricted movement. With its sporty design and performance features, the Nike Women's Aeroloft Running Vest is a top choice among active women.