Originally Posted by
JohnDThompson
GoreTex and vents help, but even then I can get pretty damp from sweat. It still beats getting soaked from rain, though.
If it's just a light drizzle and not too cold or windy, wool is a good choice.
Wool is also a good choice under your rain jacket especially if your a sweater since it is just about best at retaining insulation when wet, just ask sheep.