I saw reviews of some joggers saying it was great at something like 35 degrees, so I figured I'd give it a shot.  However, I bike, which means I go up to about 30MPH, so obviously the effect of the cold air is amplified a bit over what a jogger would experience.

That said, these work great when it's above 55 or so, which is good... just not EXACTLY what I was hoping for.  I'll just need to get something a little more thermal for the cooler days.

Construction and quality is good.  Comfortable (though I suggest washing it first to break it in a little) :), and it looks nice.  Overall I'm pleased with it.