system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is "microfiber" and why is it the only thing I can use to clean my glasses without smudging?
gpt
Extremely thin fibers of polyester, polypropylene, or polyamide.  These fibers are 1/100th the thickness of an average human hair.  In cleaning products they are split and a cross-section of a fiber looks a bit like an asterisk.  These tiny gaps trap dust, dirt, and liquids more effectively.