GSI Super Quality Waterproof Neck Band Headphones With Built In 4 GB MP3 Player - For Swimming, Diving, Surfing And All Outdoor Sports - Green
Super light weight -- to the point that if I take it out of my ears and just rest over my ears my instincts are to check every once in a while if it's still there.  Audio quality is good enough.  Battery life is amazing.  I've got at least the 10 hours on a single charge claim.  Volume and skip forward/back controls.  Funky color though (green).  Haven't gone fully under water, but it has gotten a bit wet.  Seems good quality build.  Custom USB charging cable I don't like in case I lose it.