I love this tank top. It is great for hot and humid runs.For sizing purposes I bought a medium. I am 5'4", 135 lb, 35" chest and have an athletic build. The medium is slightly loose but I think the small would have been too small for athletic activities. I get compliments on it all the time.
I love the quality, feel, and color of this product. It is super soft and I wear it to all my GOTR events. This shirt is definitely a women's cut with shorter sleeves. It also runs small. I am 5' 4" and 130 lb with a 34" bust and I needed a Large so it wasn't so tight around my chest.