I have two of these hooded rain jackets that are almost identical. One is from Anti Gravity Gear, and it is pure black sil-nylon. It is a bit oversized, so that contributes to ventilation from below. It is fairly waterproof, and it works for me.
One other one is near-black, and it is home-sewn from Pertex. It is not quite so waterproof and it breathes better. I wear it more around town where death from hypothermia isn't so likely.