The key to staying warm during chilly runs is layering, and the most important layer is the one directly touching your skin. For this base, you want a compression material like the
Mizuno Breath Thermo Running Crew. The DYNAMOTION FIT design will keep you dry with its polyester/polyacrylate material and won’t chafe, unlike some other compression shirts available. The crewneck also comes in a variety of colors—ranging from an eye-catching neon yellow to a simple black-and-blue—and each has reflective piping on the side panels, making for a sleek, but useful, design. ($69.99,
mizunousa.com)