Tilleys are designed for hot weather, so overheating shouldn't be a problem. If you are happy with artificial fibres they even have a model called airflow, which could be called extra-ventilated, but I would personally prefer the natural fibre originals. If natural linen shirts are available in your region they would be my favourite for hot weather, though cotton is good. Folk reckon silk is very good, but I've never tried it. Its cultivation and care also count against it for me. Course around here the main problem with hot weather isn't how to dress, but how to find it.
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