It's not every day that you get perfect blue skies and balmy riding temperatures. When you're not so lucky, take the edge off autumn's chill with the Trail-Series Alpha Jacket. This thermal midlayer is built for shoulder season rides, with a wind-resistant face and lofted fibers against the skin that trap warmth while still allowing heat and sweat to escape. It's soft enough to wear directly against your body, but fitted to allow room for a base or two.