Do your in-ear phones slip out of your ears? My, what big ears you have! Well, Koss solves the cavernous ear canal/tiny earbud problem with its custom CC_01 earbuds.

On the back end of the earbud is a metal screw top. Turn it, and a rib cage holding the rubber tip on expands giving you chubbier buds. You essentially can make the earphones fit your ears as snugly as you like — a first as far as we know.

The CC_01 will be available in March for $150.