OR, thanks for the info. I looked and found a single pocket nylon shirt that looks promising and light weight. I have ordered one and will let you know how it works. Wandering Daisy suggested that I don't really need a 100% synthetic shirt and, in fact, I never wear one around here in the summer. So, I think I'll give one of the 60/40 shirts a try. It should be OK for my adventures in Arizona and in the summertime Sierra. I'll be sure to let you know.
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May I walk in beauty.