This is a great top for summer - it was blistering hot this summer in Michigan and being older I don't usually ditch my bra, but this top was perfect because it has a sturdy built in bra that kept things in place and hid any protruding things. The material is kind of stretchy and wicks well, and the color blue was really pretty. I'm 5"4', 105 pounds and went for the xs, it fit very well. I use it for general wear and also for biking.
I love Prana tanks, aside from their price (OUCH)...I ordered the purple one. It fits great (I'm 5'10", 150lbs) but BEWARE! It has white straps! I am usually looking for this but forgot this time. White straps turn nasty dirt-colored if you plan to use this top to do anything but work in a hermetically-sealed room. I may get all artsy and just dye them...we'll see. Otherwise, I love the top...I plan to use it for yoga, climbing, and kicking around town. I love the criss-cross strap design too.