I love this bra.  It is extremely comfortable. I find it very hard to find a bra that fits comfortably.  I have a very small bust, barely an A, but I'm a 38.  This bra is one of the only ones I have found that I can wear.  It works great under form fitting shirts, but if the shirt is too wide at the shoulders, the straps will show and they aren't very attractive.  It's also lightweight enough that I don't seem to sweat in it as much as other bras (and it gets very hot where I live).  I have slept in it on occasion and it was hardly noticeable.  I wear a medium to be comfortable around me and it still fits me perfectly on my small bust size.  I love the reasonable price, it helps to stock up!