It was used by hikers and Mexican workers in the southwest.....
Stop letting sterotypes get to you.
I'm with you on the cotton thing, but if you've ever used one you would know somehow it doesn't act like cotton. They wear it in the desert and in the tundras because it keeps you cool and keeps you warm depending on what you need.
99% of the time I'd say never use cotton, but this and one other peice of cotton have actually worked.