I did contact the seller, he replied saying these are the new ones they have in and that the advertised earbuds he no longer has. It has a little bit of stretch and fits a curvy body really well. After losing my old 500 and 600 earpieces in one week, I bought this and a 250 as replacements. For my use, Im happy with them. 5mm audio jack is another plus. No idea why the Keens dont have this! Love these slides! Keeps pulling out of your phone as you walk. I saw this product on line and decided to give it a try. With sound playing, like the XM3s, you wont hear much.