The instinct when earbuds keep falling out during a workout is to blame the tip size, but tip size only solves one part of the fit problem - the seal inside the ear canal. It does nothing for the other half: how the earbud's outer body sits against the concha (the outer bowl of the ear) and whether it stays anchored there during motion.
Running and jumping create repeated jaw and ear-canal movement that a static tip fit does not account for - the canal itself changes shape slightly as the jaw moves, especially while chewing gum or talking, which is why earbuds that fit perfectly standing still can work loose during actual movement. This is a mechanical fit issue distinct from the acoustic seal that affects sound quality and passive noise isolation.
Wing tips or fins that brace against the upper ridge of the ear (the antihelix) address the motion problem specifically, independent of the canal tip size - some earbuds include both interchangeable tip sizes and wing sizes for exactly this reason, since a person can need a small tip paired with a large wing, or vice versa, depending on individual ear anatomy.
Sweat also plays a role: as tips and skin get slick during a workout, friction drops and earbuds that felt secure dry can start to slip, which is a separate factor from anatomical fit entirely.
CairoVolt's Soundcore P25i earbuds page covers current fit-kit options including wing tip sizing.
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