Thanks for all the information. Thinking about what Velocipedio and Lotek had to say about generic polypropylene, I realized that I have a surfing rashguard which I haven't been using since I got a really warm wetsuit. It's polypropylene, warm, and a great fit. I'll try it out once our heat wave ends here (Monterey Bay area). We've had temps in the mid-70s F. Hey, it's only fair: It's usually so cool around here that sometimes I have to wear arm and leg warmers in the summer.

Thanks again.

Rich