Hats and gloves are key!

Covering up.

when I'm running, I rely heavily on my hat and gloves to regulate heat- when I start in cool/cold weather I have both on, when I start feeling a little too warm, off come the gloves, if I continue to warm I pull my beanie up off of my ears (but still on my head), if that isn't enough, the beanie comes off (then I start on my upper/outer layer)

just the opposite if I cool, beanie come back on, pulled down, gloves back on

I am really amazed how simple, yet effective this method is for regulating temps

I haven't got around to naming my patent system yet :)

thermal regulation

Edit: http://www.backpackinglight.com/cgi-bin/backpackinglight/00184.html#.VMO9eFpg5nE

Ken hit the nail on the head.

oh great, just ready to name and patent it and Ken comes up with an existing name for it- figures :)

Love the hood on the OR Ferrosi I wear in cool to cold temps, especially when it's windy.
Until it hits the low teens, I'm not wearing more on my hands than Manzella silkweight Windstopper gloves, or on my head than a Nike golf cap, or a Buff fashioned as a beanie.
That hood makes all the difference, though, and is very convenient. It goes up and down depending on the wind, temperature, and extertion.

Uncommon sense.
Still amazes me that so many don't get it but such is life.
(I have mentioned in the past that rather than turning up the heat maybe closing all windows works better…, our bodies, in my view, are not different)