If you're heading outside for an early morning run, it's pretty nippy out there! A tank top and shorts just won't cut it anymore, but it's not quite cold enough for Winter running gear. Here are some of my favorite long-sleeve shirts to wear on chilly runs, listed in order of lightest to heaviest to help you find a layer that's perfect for your weather. If you get really cold, pair these layers with your favorite vest or windbreaker.
Long-Sleeve Layers For 40-Degree Runs