I love my tulip tank - so cute, so comfy. I found it moves around a little too much for yoga but is perfect for hiking. Breathable, with air vents!
My one complaint is that if I'm wearing my usual andie bra underneath, the fabrics stick together quite a bit, so if I wear the petals forward they are always folding and opening the tank up. As a result, I usually put the petals in the back! I bought my usual M and the sizing is perfect.