The North Face Men’s ThermoBall Eco Vest is a lightly insulated vest for layering up in a variety of weather changes. Set off on a hike and whether this vest is packed into its own pocket and in your pack or already being worn, it’s ready for the unexpected. It offers core warmth by using quilted sections to secure ThermoBall Eco insulation inside each little square. The slim fit runs close, fitting over a base layer and underneath a shell when necessary. The recycled fabric exterior (nylon or polyester depending on the style) is lightweight and treated in a durable water repellent finish.