I just tried one from old navy today and it worked well, it's their RecTec stuff, they had tshirts for $10 one day when I was in with the wife and kids and they were another 30% off that so I figured I'd Ty it for $7, it's great compared to the cotton tshirts I usually wear.
Just a sime t-shirt cut but the thin wick away type material is very similar to the $90 jerseys in the shop window.
I also bought a pair of their RecTec shorts to wear over my padded bike undershirts and they are great as well, they were like $8
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