Since the feet seem to be both the most valuable and most vunerable physical asset while hiking the AT, what are the steps you take to insure their health?

I have been rubbing mine with rubbing alcohol to toughen them a bit, and plan to take medicated powder with me to put in my socks each morning. My boots are well broken in. I have not yet decided on a sock yet, but am planning on taking at least four pair. I usually hike with two pair until my feet have toughened. I'll take moleskin and probably duct tape.

I am interested in what others do to protect their feet, and which brand and type of sock that you may prefer (and why).