KEB24g Not worth the money

The KEB/24 is lightweight with an in-the-ear design for deep bass and listening to music on the go. The KEB/24 features a dynamic element that is positioned just outside the ear for extended frequency response of 15-20,000Hz. The KEB/24 includes small, medium and large silicone ear cushions for a customized fit to enhance isolation when you want to eliminate ambient sounds that interfere with the listening experience. A flexible strain relief has been added for comfort. The KEB/24 is available in a variety of colors to compliment today's portable MP3 players. Built to last, the KEB/24 is covered under the Koss' No-Questions-Asked Lifetime Warranty - the only warranty of its kind in the stereophone industry. This review was taken from Koss' website.

I bought these after my old pair of Koss Plug headphones finally wore out. I would not recommend these to anyone with an active lifestyle. If you sit on the couch or computer all day, than these may just work for you.
I wear these when I go running, and I have tried all 3 sets of the silicone ear cushions, none of which fit well I might add. There is no sound isolation either. The earbuds fall out within about 40 paces on my runs, then I have to either put them back in or readjust them as they are falling out which breaks my cadence. Koss needs to go back to the drawing board on these. If you do need a replacement pair in a pinch, save youreslf about $8 and get the Koss Plug earbuds.