If you've never gotten into Merino wool jerseys, do yourself a favor and pick one up and find out what all the fuss is about. They vent extremely well in the heat, keep you warm on cold days (I layer one or two long sleeve wools under my shell for winter riding), and are the only thing that will still keep heat when thoroughly soaked in a rainstorm. There's a reason wool has been the preferred material throughout most of cycling's history. It just works so well and today's ultra fine soft Merino has taken wool riding clothes to the next level.
Not to mention that if you're doing multi day stuff, wool doesn't go all nucleur with the stink after one ride like synthetics tend to do.
Yes, they cost a bit more than our standard riding jersey, but they've got style for miles, great thermal properties, and last for years.
This thing's got an All-City brand blue body, with nice blue detailing on the collars, chain stitched All-City in the Cutter's font, and a contrast back black pocket.
2013 Short Sleeve Limited Edition - $120