I will be walking the 3000km ‘Te Aroroa’ in new zealand, starting november. I will be outside all day, everyday, for 4-5 months. I was going to buy a UV protective shirt because of the constant exposure for so long. This article seems to recommend something different entirely (as long as there is no sun burn). Normal shirts also protect from the sun (only less). Seems to be sufficient according to the article though..