I started developing "issues." Let us just say a little "chafing of the cheeks" and leave it at that.
So I began looking for alternatives that wick sweat and dry quickly. I pulled out my simple Ibex bra, and ran in that. Wow, what a change from sticky, heavy cotton (regardless of the fact that cotton starts out lightweight, it quickly droops with sweat).
Since my Ibex bra did so well, I bought two more.
This is not recommended for high impact activities, and it was originally purchased as a travel bra since I would not have to wash it much (it performed very well on vacation).
For me, it also performs well as a running, walking, aerobics, and weight lifting top. Being that my body type does not store much body fat above the waist, I am not overly endowed in the chesticles department. As such I have no fear of falling out, nor of pain, as a result of enthusiastic movement within the confines of this article of clothing.
I highly recommend it for B cups and smaller for anything you desire to do within it.
Granted, in aerobics, I do hear what little arm fat I have cheering me on as it flaps against my rib cage, but that it NOT the fault of the bra!
Ibex's Balance Sport Top
Since I enjoyed my bra so much, I decided to try the Sport Top. I'm not likely to go out in company with my belly exposed - it does not get sun, it is a bit flabby, and I just would not be comfortable saying "Hey world, can you guess how much body fat I carry by looking at my abs?"
I did find the low side cut a bit disconcerting the first two or so times I wore it, but I've quickly gotten used to it and would not want it any other way. I currently have two. They can get a little warm in extreme heat, but I'm quite comfortable in anything at or under 80 degrees F.
I do have a variety of tank tops from Smartwool and Icebreaker, but prefer to use them in "nice" outfits rather than as exercise clothes.