Try Another Eartip Size - Bose QuietComfort Manual

HOW TO WE A R

TRY ANOTHER EARTIP SIZE

Wear the earbuds for an extended period of time. If the eartips don't feel comfortable
or secure, or sound quality isn't as expected, try another eartip size.
The size is marked on the bottom of each eartip with a 1 (small), 2 (medium),
or 3 (large).
The size 2 eartips come attached to the earbuds. If size 2 feels too loose, try size 3. If it
feels too tight, try size 1.
You may need to try all three eartip sizes or use a different size eartip for each ear.
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