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A couple of options:
As stated above, Unbound Merino has some lightweight shirts.
Another option is Woolly Merino
Woolly Men's Shirts
A third option is to consider Sun sleeves. There is a current thread on the subject.
Before
Curiosity at first. Then, seeking information.
Not active, been lurking for about a year.
Daily. More if I find interesting threads.
Knowledge and getting a better idea of what to expect on the camino.
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