An earbud that is perfect on the sofa can work its way loose in the first kilometre. Your ear is not a static shape — chewing, talking and the impact of each stride all move it.
Start with the eartip, not the earbud
Most people use the medium tips that came in the box because they were already fitted. Many of those people need large on one side and medium on the other. Ears are not symmetrical, and mixing sizes is normal, not a defect.
Quick test: put them in, then hum. If the hum sounds full and slightly boomy, you have a seal. If it sounds thin and you hear the room clearly, you do not — and you are also losing most of your bass.
What a sports design adds
An ear hook or fin braces against the ridge of your ear so the seal does not depend on friction alone. Once you are moving, that mechanical anchor matters more than any coating or material. Our DW-135 Sports Earbuds are built around that idea.
A neckband version — the two buds joined by a cord behind your neck — is less fashionable and dramatically less likely to end up in a drain. Worth considering if you have already lost one bud.
Reading water ratings honestly
- IPX4: splashes and sweat. Fine for running and the gym.
- IPX5-IPX6: sprayed water. Fine in rain.
- IPX7: brief immersion. Survives being dropped in a puddle.
None of these mean swimming, and none of them are permanent — seals age, and sweat is salty and more corrosive than water. Treat the rating as protection against accidents, not a licence.
Habits that add months of life
Wipe the buds dry after a session, especially the mesh over the nozzle where salt collects and gradually mutes the treble. Do not put damp buds straight into a sealed case — leave them out for a few minutes. Rinse silicone tips in warm water weekly.
If they still work loose after all of that, the shell shape probably does not match your ear, and no tip will rescue it. That is a fit mismatch, not a fault — switch to a hooked or neckband design rather than buying another pair of the same shape.