Sitka Gear Men's The Bandit Face Mask, Optifade Open Country, One size fits all
A simple desing that can be used for many things.  Pull it up just over the bridge of your nose as a face mask, leave itloose around your neck to keep the sun off, or pull it up hight in the front and back for added warmth.  A small slit for your mouth makes it possible to still use your calls easily.