OCModShop posted a review on the Acoustibuds Earphone Adapters

Acoustibuds are add-on silicone adapters that can be slipped over generic earbuds. Not only does it prevent your earbuds from slipping out, but it makes them more comfortable, too. Regular earbuds are "one size fits all" and remain snug by pushing your ear's cartlidge around hard plastic. After a while, your ears start to hurt. With Acoustibuds, the hard plastic is out of your ear, and replaced with a soft, rubbery silicone canal with fins.

Acoustibuds Earphone Adapters Review