My husband swears by these things. They have lots of teensy pieces, but they work like a charm, and weigh almost nothing. They are, I have noticed, easier to forget on an airplane than the massive over-the-ear version. :)
My co-workers hated these earphones. Why? Because could never tell if I was wearing them at my desk, and they would be yelling across the room, trying to get my attention, and I seriously could not hear them! These earphones really know how to isolate your music! Great sound quality and bass too! The drawback, it doesn't fit on my iPhone, but you can buy an adapter for that. The company who makes this also does research and development for hearing aids and high fidelity sound for musicians, so it seems very trustworthy. They're perfect for public transportation, road trips, and especially office use.