I'm curious about this too. Not so much from a sweating standpoint but from a finding one that actually will fit! I am 5'11, 44 inch waist pants and a 54 inch chest! I just looked at a jersey retailers sizing chart and it said I need a 6XL size? they don't even offer one that big! Huh? I wear a 2x - 3x shirt, and the 3x are genrally loose. Do I really need to by a Jersey cut from the side of a friggin tent?
I ride in 3X cotton T's as they flap enough in the breeze to keep me cool, but I know I'd be cooler in a wicking type cycling shirt... any ideas?