There are a few ways to keep your earbuds on your helmet. One way is to use a strap that goes around the back of your head. Another way is to use clips that attach to the side of your helmet. You can also buy earbuds that come with a special adhesive pad that sticks to your helmet. Whichever method you choose, make sure that the earbuds are securely attached to your helmet so they don't fall out while you're riding.