New Balance x J.Crew NB Heat Athletic Vest Mens Medium Black Navy Blue Full Zip New Balance x J.Crew athletic vest engineered with NB Heat technology to capture warmth and wick away moisture during cold-weather workouts. Designed with an athletic fit that skims the body, it includes a full-zip front, secure zippered hand pockets, a vertical reflective strip on the back for visibility, and a small zippered rear pocket for essentials.