Dryer Query

I just noticed this today. The clothes dryer in my home has a strange slider for adjusting the temperature at which the clothes are dried. It has little nubbin' best pinched between thumb and index finger, and slides up and down. This in itself isn't very strange, but this is what held my attention: at the top of the slide is the "Regular" setting; three increments down is "Medium"; then three more increments down there is "Delicate" and "Light Fluff". So here's my question, "What does it mean?"
How is "Delicate" a temperature? Medium and Regular are very nearly synonyms, or have evolved to be nearly synonymous. There doesn't seem to be any rhyme or reason to the sliding scale. What is light fluff?
Temperature is relative, different people have different ideas of what regular temperature means. A man born and raised in Mexico City, Mexico will have a very different idea of "normal" temperature than a young lady living in Anchorage, Alaska.
This is a pretty nebulous line of thought, but it was significant for that moment I did the laundry.
And because I am writing this Monday, March fourteenth, 2011, I would also like to mention the ongoing natural disaster aftermath in Japan. Hopefully I'll send some money for relief soon, I hope you do too.

Arigato.