I'm having trouble keeping my back dry with my Golite Pinnacle. I'm not sure if it's the Pinnacle or the polyester shirt I'm wearing. It's a Nike Fitdry shirt, which is supposed to stay fairly dry.
The other potential cause could be that I'm using my Big Agnes Insulated pad as the frame for the pack. Could the insulation in the pad be causing my back to not breath as well?
P.S. On a side note, does it make any difference if you use an acrylic knit hat, or is wool much better?

