In your experience, which socks offer the absolute most heat and possibly aid in circulation?

Im looking for socks that are not overly thick yet offer great insulation.

I suffer from a lack of circulation during rides. Even in perfect weather, my feet sometimes get cold. I have even worn thicker non cycling wool socks during the summer, and never seem to suffer from moisture problems, and my feet stay comfortable. For me, its like winter socks are perfect for summer, and not good enough for winter...

My current shoes are slightly on the tight side and seem to fit perfect for cycling. Any bigger and my feet would probably slip around in the shoe.

I had one other pair of shoes which were more loose and I had the exact same problem. I think the lack of circulation is not caused by the shoes, but rather just the general nature of my feet when cycling.

Admittedly, all of my shoes are summer specific with lots of vents. Im thinking about buying some shoe covers. I tried some before, but the zipper chafed the back of my achilles tendon. It was not a good experience.

I wear highly vented shoes for running and my feet never get cold when running, even in temperatures under 30F.

Since my feet usually seem cold, Ive thought about wearing winter socks year round. Is this a good or bad idea?

Anybody else have colder than usual feet when cycling?