New Balance Impact Grid Vest - Men'sEven the coldest runs won't stop you when you rock the New Balance Impact Run Grid Back Vest. This men's running vest features technology to help keep you warm, including NB Heat and Vaporloft Fill that insulates without weighing you down. Snap closures let you adjust to temperature changes as you go, while the athletic fit stays snug to the body without getting in your way. Features Features NB heat grid fleece to capture warmth and manage moisture