I use a Specialized Body Geometry Avatar. I try to remember to throw a cover on it if there's a chance of rain when it's parked, but it's nice knowing that there's no special care needed to keep it dry. My first one had some kind of felt patches where the sit bones touch down, and those deteriorated over time causing me to replace it. The newer version appears to be all synthetic fiber. I can't compare it comfort-wise to the fabled Brooks, but I liked it enough to buy it twice.