Lena.khwrote a review of Icebreaker Superfine 150 Retreat Tank Butterfly - Women's on October 15, 2011
It fits great, looks awesome, and feels amazing! I'm ordering more in each color. I'm 5'6", 130lb and got a M (I was 140 when I bought it first). I'm planning to try S size as well, just to get one that's a bit more tight around the waist, but M is already a perfect fit if you don't like too tight-fitting clothes. It's my go-to shirt for any summer outdoor activity.