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.