Lint is composed mainly of short fibers from the cloth making up your clothes. It gets “felted” from the combination of moisture and compression.
“To do her justice, I can’t see that she could have found anything nastier to say if she’d thought it out with both hands for a fortnight.”
Dorothy L. Sayers Busman’s Honeymoon
I take the dryer lint and leave it in the woods. I imagine some little critter might want a soft lining for their nest. OK, so I’m a bit tetched in the head…