Gloria
Ski Diva Extraordinaire

The main difference between wool and sythetic baselayers is thermoregulation or how they balance body heat by transferring moisture.
Wool - Transfers perspiration in it's vapor state prior to it turning into moisture.
Sythetic - Transfers after condensation. Not quite as fastidious as wool but doesn't hold moisture and does transfer it away from the body so still prevents chilling.
Wool experts will argue that your muscles will work less because their product is superior at thermoregulation and you will produce less lactic acid, but I don't know that I would get this technical in my decision making as wool is also alot more spendy and for all the years people have worn sythetics, I haven't seen alot of people keeling over skiing from too much lactic acid.
Don't get me wrong, I love my wool pieces, but I also think sythetic is just fine too.Either works well, depending on your personal needs.

