Heavier fabric than the average tee shirt.  Deeper vee than average, as stated in the ad.  Fit is a little more snug than expected.  Pads under arms are generously sized and should suck up a ton of moisture.  Kept my dress shirt dry as a bone in a recent singing performance wearing a suit jacket for two hours on stage under lights.  However, while it DOES suck up perspiration like a ShopVac, the idea of it leaving as vapor is a fantasy.  When I took it off the shirt felt like a towel after a shower.  But my clothing was dry so it retained the wetness anyway, and that is what is important when you are wearing fine fabrics.  My only reservation is that if it shrinks it will be too small.  Will update once it comes out of the wash!