For help with sizing, I am 5'5'', 140 pounds, bra size 36B or 36C and ordered a Medium. It fits well. It isn't a fitted style, it's loose-fitting which I like since I am wearing it in very hot weather and it allows air to circulate well.
The orangey-coral color (Ember) is very bright but I like it. The fabric has a lovely natural subtle sheen to it and is very lightweight, soft and quick-drying. I have worn it a few days in a row in hot sweaty weather cycling a lot and it doesn't smell.
Support: depending on your bra size and your body shape, you may want/have to wear a bra underneath this tank even though it has a built-in shelf bra. This is because the top is quite low-cut (don't buy this tank if you don't like low-cut tops!!) For this reason the top seems more geared towards the city end of the scale - for going out - and it can be a flattering top. But if you are a B or bigger cup size and want to use it for hiking, yoga or other sports it's a bit too low cut and unsupportive without something underneath.
The racerback and gathering at the neckline look good and overall I really like this top.
I would give it a 5th star if it were not quite so low-cut and unsupportive for curvy women.