Although our troops use these shemaghs over in the sandbox I bought one on a whim just to see what they are all about.  You can find info online on how to wrap the shemagh around your head like the photo.  It takes a bit of practice but once you get the hang of it it only takes a few seconds truss yourself up like a real Jihad Johnny.  I have found that in winter putting a fleece beanie on your bald head and covering it with a shemagh is very warm and cuts the wind.  While camping, a shemagh has a 1,001 uses like the "drive-on" rags we used to wear in the army back when the earth was still cooling: it's a towel, it's a water filter, a bandana, a wadded up pillow, a neck gaiter,  a dressing/bandage for a mean laceration.... you get the drift.  For the price, you can't go wrong.