Quote Originally Posted by OakLeaf View Post
You don't need to worry about the 305 getting wet, it's IPX7 water resistant, which off the top of my head I think is 30 minutes at a 1 meter depth. It's not waterproof for swimming, and that's what's different about the 310XT, but all the Garmin heads are plenty safe for rain use.
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.