This is a 4 star for me but it could absolutely be a 5 star for a smaller busted woman.  It's incredibly comfortable and soft, I wear it on hikes and it does great moisture wicking and keeping me dry.  The only problem is it's not very supportive for bigger busted women; I'm 5'3, 115-120 lbs and usually wear a medium sports bra or 32C/32D regular bra.  I bought the medium and it fits great but not supportive, or flattering with tighter fighting shirts.  Loose shirts hiking is great and I will continue to wear it but I will also continue looking for a merino wool sports bra I can wear for running or crossfit.