BuyFromEU

Before this movement started, I bought a lot cheap under armour shirts with a mixture of 60/40 % cotton to poly.

Idk. what mixture you are going with, but up until now that percentage (and slightly off) works, really well as the cotton soaks the sweat. I’m washing it on regular temps (in a regularly cleaned washing machine and with sports detergent) and have no probs since over two years. Maybe you can find something similar.

As for EDC shirt I really just go with cotton shirts lately and use the same washing routine. I tried wood based shirts (wiljd) but they loose shape and color too early. And (pure) merino shirts are to expensive and will attract holes if you’re washing them like normal shirts. Merino mixtures might be an answer (but still expensive).