Mammut and others have done a similar "body mapping" thing with baselayers in the past. I have experience with Polartec Powerdry and while I think it's a great fabric, it's much too thick/heavy for my taste in a baselayer. For more stationary hunting scenarios it would be fine. Powerdry breathes very well and dries quickly as the name implies--among the best wicking properties of any fabric out there in my opinion.