First the specifics: The shell is 90% cotton and 10% Spandex; the lining is 80% nylon and 20% Spandex; it can be machine washed but not dried; and, best of all, it's made in the USA!!
Although the T-shirt is heavier than I expected (but that's a good thing), it is very cofortable to wear, provides good support (even after 7 washings), and the 'V' is just right. I did find that the fit was rather tight in the underarms . . . probably because I bought a size smaller then I normally wear. The underarm tightness was an easy remedy . . . I cut off the sleeves. It is a bit difficult to put on and more difficult to take off . . . ditto, smaller size. But then, what do you expect from Spandex? Eventually you will come up with your own way of putting on and taking off the T-shirt. Next time I'll buy it in my regular size just to see how that works out.