People ask me constantly what I wear for long runs, and the honest answer is that I've settled into a very short list. I've stopped experimenting. These are the things I reach for at 5am without thinking about it.
I'm not sponsored by anyone. I just got tired of replacing gear that pilled after two months.
The tee below is the one I get asked about most. I've put roughly 800 miles through mine and it still looks like it did in month one — which, for a cotton blend, genuinely surprised me.
If you pick one thing off this page, make it that. Everything else you can substitute; this one I'd buy again at twice the price.