I really wanted to find a good wire-free option that gives a bit of support but that doesn't smash the gals down like a sports bra. I ordered three, and this one was the clear winner. Below describes my findings....

This one, "the Barely There Women's Customflex Fit Lighly Lined Wirefree" is really comfortable yet provides more support than I had expected. I'm normally a 38-40 C/D in a normal wired bra, depending on the brand, and I went with a large in black. Now, this does hook in the back (unlike the other two I tried which are pull-over your head type) and it also has adjustable straps. Typically on my day off or when traveling in the tropics I wear the tanks with a shelf bra under a shirt, because normal bras with underwires aren't always that comfortable, and they don't always agree with hot, sweaty weather (for me at least...). This bra surprisingly provides more support than the shelf tanks. It also provides some lift and separate, so there is absolutely no uni-boob going on. Honestly, I'd actually wear this one out in public w/o hesitancy. The only downside is that I wish it had a bit more support on the sides, as I can see the girls pushing out to the sides more than I would with my underwire bras.

The next one I tried was the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Barely-There-Microfiber-Crop-Top-Bra/dp/B004BIWQTU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Barely There Microfiber Crop Top Bra</a>&nbsp;in skin tone, size large. In this I was swimming. I had read to go down a size, but historically whenever I do that with shoes, clothes, etc. I regret it and want the larger (I don't like things tight) Anyhow, this was super loose - it felt like wearing a loose t-shirt almost, there was no support at all. Also, in the mirror it looked very much like "grandma's underwear". So for me, this just didn't work out. Perhaps if I'd tried the medium I'd have liked it, but after seeing the granny look I'm not likely to give it a try.

Lastly, I had the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Vanity-Fair-Women-s-Illumination-Leisure-Bra/dp/B004P5OW6E/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Vanity Fair Women's Illumination Leisure Bra</a>&nbsp;which has a cross over style and looked so cute online. However, as some of the reviewers mentioned, it is not well suited to gals wearing a larger cup size. I'd say if you're over a B cup, don't bother. I ordered black, size large, and it looked like those triangle bikini's that barely cover a gal's areolas. Such a bummer, as I like the cross over look (maybe I'll try a different cross-over in a different brand...)

If you're bigger on top (C+ cup size and a 36-38 or greater) unsure about which to go with and don't mind a hook in the back then I suggest giving the customflex a go.

Now that I found a winner, I'm ordering a couple more in other colors!

Here is the sizing as listed on the packaging with the bra:

A/B, 30-32 = XS
A/B, 34-36 = S (or go up if 36 B)
C 34-36 = M
B/C, 38-40 = L (or go up if 40 C)
C 40-42 = XL