NWOT Carhartt V01 Duck Vest, also known as the Carhartt Men's Relaxed Fit Firm Duck Insulated Rib Collar Vest.  This vest is made of durable 12-ounce, firm-hand, 100% ring-spun cotton duck, and is insulated with arctic-weight polyester.  It is designed to be water-repellent and wind-resistant, providing warmth and protection in various conditions.  Key features include a rib-knit collar, a brass center-front zipper with an interior storm flap, and multiple pockets for storage.  The V01 Duck Vest is a popular choice for layering, offering warmth over a long-sleeve tee or hoodie, or under a heavier outer layer.