system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do older bath towels absorb water so much better than brand new towels?
gpt
Brand new cotton fibers have a layer of natural oil in them that improved softness. New towels may also be treated with oils or waxes to enhance the softness of the cotton fibers. These oils prevent the fibers from absorbing liquid efficiently.

After several washings the oils no longer remain. The towel dies not feel as soft, but it gets you dry quicker.