Gear up Nau for winter and spring training. Keep your core warm without overheating with our favorite transitional down vest by Nau. It's not an official "running" vest, but over the last two years we've tested it through all kinds of weather and found that it's perfect for cold weather running. Layer it under a jacket in the winter or over a long-sleeve in the spring and fall. The high neck keeps you warm, and the slim, longer fit feels femine and covers your midsection. The Nau Down Vest for women is worth the investment (and it's on sale right now for $108 - normally $155!).