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I'm normally quite happy in anything I've picked up from Decathlon, but I recently threw in a running singlet on a Wiggle order to qualify for free delivery, and I think it might be my favourite warm weather running top. Really light, soft material, hangs very well. Is slightly generous in fit so where I'm borderline S/M, the Small is a nice fit. Not snug, just hangs nicely.
Edit... not technically a "tee" but when it's particularly warm I do like a bit of air on the shoulders. :)
Best running tees for hot weather (or just generally)? Started running in the Autumn and have nothing appropriate for this week!