Bose SOUNDCONTROL Owner's Manual page 26

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Set up the hearing aids
Is the eartip size correct for each ear?
The size of the eartip affects comfort and stability.
Correct size:
• The eartip feels secure, though it may feel strange
at first (see "Adjusting to the hearing aids" on
page 38).
• If you shake your head and open your mouth, the eartip
feels comfortable and doesn't move.
If the eartip feels uncomfortable or loose: Check whether
the eartip is too big or too small (see page 70). If it is,
you can replace it with a different size.
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