The form factor is very dependent on the shape of your ear. So for example, in my right ear it sits just incredibly tight and I can run, jump, pull up, etc., etc., they don’t care, they sit tight and for a long time. Slips a little in the left ear. If I put it very carefully directly into the left ear, then it’s still normal, but after a while they begin to slip out of the left ear a little. Not critical, but still. Therefore, if there is such an opportunity, it is advisable to measure it by ear.
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