The newest addition to our bestselling HyBridge® Knit family, the HyBridge® Knit Vest is the perfect layer of lightweight warmth. It can be worn as outerwear over a t-shirt, or under another jacket for an added layer of insulation without adding bulk to the arms. Thermal Mapping® places insulating down-filled panels where you need it most, and a breathable knit technique in areas that tend to overheat.