Originally Posted by
woodcraft
Sweating doesn't cause cooling, it's the evaporation- turning from liquid to gas- that does it.
If the sweat runs onto a loose-fitting jersey, & evaporates there, it cools the jersey, but not as much the skin.
By keeping the evaporation right at the skin, the base layer produces more cooling with less sweat.
Very good explanation. This is what I was referring to when I mentioned "race-fit" vs. "club fit". I'm not totally sold on the concept of the additional based layer as I haven't tried it in extreme conditions. I can say that so far the base layer has been very comfortable and I've stayed cool in some fairly warm conditions.
Maybe it's a personal thing. Try it. If it works for you, great. If it doesn't, move on. It would be a very reasonably priced experiment. I spend 10-15 hrs. per week, or more, on the bike. Being as comfortable as possible while riding is not a small thing.