These are THE BEST TANK TOPS!!!! I only recently discovered them and I adore them. I normally take an XS in women's sizes, and I have been getting these in Small or XS because Walmart was out of certain sizes in certain colors, and to be honest if they were available in both sizes I would get them in both XS and in Small for each color. The XS fits snugger obviously, the Small is by no means loose, but the difference in sizes is just enough to warrant an XS for under things or to wear for lounging around, and the Small to wear with support underneath for a leaner, more polished look. I like them so much better than the cotton ones available at some of the mainstream retailers (Gap, Old Navy - on sale you can get their camis pretty cheap, too). The cotton ones aren't bad, but these wash well and thus far I can tell should never pill (I can't stand pilling, I have no issues with holes but once a garment starts to pill I toss it). I haven't noticed any shrinking. They are very stretchy, and nice and long if you want them to be, you just pull them down a little extra. They tuck into bottoms well, too. They don't stretch out for the entire duration you wear them, they stay as fitted as when you first put them on. All colors I have bought have been just as pictured in the listing. I will be keeping my eye out for more colors now that I know they exist! I did buy a long sleeve top from Walmart's No Boundaries line last year that was the same material, but I haven't wore it yet because with the long sleeves it felt like it could get very warm on (not a bad thing, but I get hot easily even in winter and prefer layers). As a tank top, with the armpits being exposed (you know, since that what makes it a tank top), the material is very cool on and it dries faster than cotton material because it doesn't soak up the sweat nearly as much. You could probably wear these tanks as bathing suit tops. I am not curvy so support is not an issue for me, I don't think they offer a ton of support if you are super curvy - you'd need to wear separate support under them - but it is no biggie with the thicker straps that hide bra straps. I know juniors sizes tend to run smaller but I did not feel there was much of a difference between this and some of my other womens sized XS/S tank tops. Again, I think it is because I have a very straight build. OK I am at almost 2500 words!!! NOT a long story short, I love these! Just try one (or 2 if you are not sure which size is for you), for $3 you can see if you love them as much as I do before you buy more, and Walmart is absolutely awesome with returns, so you really have nothing to lose (except the opportunity to own them if they sell out in your size - sadly this was true for me, I was not able to get all the colors I loved [sad face]).