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It needs to be ultralight, and 90-100% merino, not a polyester mix. I'm not sure that cycling clothing companies make such things. They are expensive and wear out quickly. I got this one https://www.icebreaker.com/en-gb/mens-baselayers/bodyfitzone-merino-150-zone-short-sleeve-crewe-thermal-top/104346.html?dwvar_104346_color=351 for touring and wore it as my only layer for cycling in 40+ C. Just right. And it never smells.
Lightweight merino is excellent in hot weather.