The big issue with cotton is that it stays wet and then chafes. In my experience, it also doesn’t breathe well. I find cotton is fine for a 5km run but especial

The big issue with cotton is that it stays wet and then chafes. In my experience, it also doesn’t breathe well. I find cotton is fine for a 5km run but especially as I get above running 15km, it’s just asking for pain.