I feel like any are good, but I prefer very thin and loose material on a tank/singlet. I hate feeling it cling and its like it makes me feel even more hot. I just got a pretty nice Saucony singlet that has a mesh like back back, just wish I got it as an XL for the aforementioned looseness. . .

http://shop.runnersplus.com/...or=VZPCT&size=XL

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