Bellybutton fluff or navel lint consists primarily of stray fibers from one's clothing, mixed with some dead skin cells and strands of body hair.
Contrary to expectations, navel lint appears to migrate upwards from underwear rather than downwards from shirts or tops. The migration process is the result of the frictional drag of body hair on underwear, which drags stray fibers up into the navel.
Women experience less navel lint because of their finer and shorter body hairs.
In men, it can also collect in semen, if he masturbated lying down, and the semen gathers in his bellybutton. It can mix with fibres from a blanket and be left behind once the semen dries if he doesn't clean himself up properly once he has ejaculated.
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