One of the only pieces of cotton gear that is recommended in UL Backpacking is the bandana.  The idea exists that although it is cotton, it is worth overlooking because of its multipurpose nature.  This item can completely replace the bandana, and add capability.  Just like the bandana it can filter murky water, be used as a wash cloth, a case for glasses, a neck warmer, head cover, sun protection…

This blog is not big enough for all the potential uses.  The best part is, it is not cotton.

You can get one here.