For runners looking for a lightweight and breathable option, the Nike Women's Aeroloft Running Vest is a top choice. This sleeveless vest is filled with lightweight insulation, providing warmth without weighing you down. It features a breathable mesh lining and laser-cut perforations for enhanced ventilation. The vest has a slim fit and a stand-up collar for added protection. It also has zippered hand pockets and a media pocket for storing essentials. Whether you're training for a marathon or going for a casual jog, this vest offers the perfect balance of comfort and performance.