Quote Originally Posted by zoom-zoom View Post
I'm not sure...I know a few people who have fried their Forerunner 305s on rainy runs. Mine has had condensation under the face after running in some downpours, but nothing too serious. I wear a wristband under it in the Summer or over my sleeve in Winter to keep sweat from finding its way into the speaker holes.
Well, that stinks - did Garmin replace theirs under warranty? Should have...

As for condensation, I think that has as much to do with manufacturing conditions as usage conditions. I always wear an absorbent sweatband under my 310XT for comfort, it's never been exposed to anything more than a few sprinkles, and it's supposed to be waterproof to 50m, yet it has condensation under the face when it's cold outside. As long as it keeps working, I'm treating it as a harmless annoyance...