Because I have these headphones. (Picture is of a Gen-2 Shuffle, but they make [used to make - no longer in production] a similar setup for the Gen-4.

The Shuffle fits behind your head, and the wires loop over your ears.

It is so nice not having to deal with dangling wires or earbuds that fall out of my ears. I have yet to find anything that compares to ease of use and general non-complication.

tanstaafl.