Originally Posted by EatRideSleep
But prepare for it to stink like holy hell. Happens with my UA gear as well. It's because bacteria from sweat adheres to polyester/synthetics, even through washings, from what I understand.
It can be resolved by soaking in white vinegar prior to wash however.
Lots of base layers and dri fits should have an anti microbial added to them to help with this as well. My older stuff smells 10x worse than any of my new gear when put through the same amount of riding.