At temps above the mid 50s, I use the typical athletic stuff. Below that, windproof shells are really nice. Don't believe a shell is "breathable" and "windproof" unless it is made of 2 different materials. I bought a gore shell for less than 100 bucks on Amazon a couple years ago when I started commuting (18mi RT). Hi Viz yellow. Removable sleeves. Wind stopper front shell, but breathable fabric on the back. I use it from now to April. A wicking base layer, cheap merino wool sweater, and a good shell will do great down below 30F.