Lynn - I just returned from working in some coffee fields in Costa Rica. It's still the rainy season down there - the temps were nice, but the humidity kept us sweating all day long. I was washing clothes every night (in the bathroom sink) because it took 2 days for anything to dry (hanging in my casita).
The ExOfficio gear (boxers, shirts, & pants, along with some shirts/pants from Mountain Hardware & Kuhl) worked well & only took on a very slight hint of funkiness by the end of the trip - I could tell, but no one else could. Once I got back to San Jose (CR), one run through a real washing machine & all the funkiness was gone. I would recommend them to anyone heading to humid climates where proper laundry facilities are few and far between.