I haven't had much luck with the C9 short sleeve shirts, they flap in the breeze like crazy. I have an older version of this orange long sleeve fleece runners jacket. It works well down into the 50's with a base layer and is tight enough that it doesn't flap in the breeze. I used some iron-on reflective tape from ebay to make it more visible after dark.

http://www.target.com/p/c9-by-champi...lot=large_2_29