They're certainly nothing all to look at, disturbingly very similar looking to slightly melted Gummy Bears. But those are custom shaped sound-isolating ear buds, perfectly formed to fit the ears of a Make editor's canals, combining some in-ear earbuds with a putty-based ear plug kit for not all too much money. Watch the video of how he did it below.
Make: Project's Collin Cunningham used a $7.50 kit and some old in-ear headphones with the stem-style that allows for interchangeable rubber inserts. Looks fairly simple, though we'll stick with our over the ear cans for now (these might be worth investigating for running duty, though).