I bought a couple of these shemaghs from Rothco, and a couple from another manufacturer.  I'm much happier with the Rothco product!

I live in Arizona, and spend quite a bit of time in the desert.  These products do exactly what they're supposed to do.  They keep the sun and heat off of you, and the sweat on you, in the the summer.  In the winter, they're thick enough to be warm, and make great scarves or head covers.

The material is a nice thickness, and soft.  These Rothco shemaghs are 100% cotton, whereas some others are poly/cotton blends.  I definitely prefer the cotton over the cotton blend.  One other minor, but important note.  The poly/cotton blend ones have a very loose weave that snags very easily.  The weave of these Rothco shemaghs is not nearly as prone to snagging.

I also really like the colors Rothco offers.

A couple of the other reviews have mentioned the size of these shemaghs, saying they're too small (42x42 as opposed to 44x44).  I have had no problems with the size of these, and have been able to easily tie them in the traditional manner, covering both my head and face.  And I have a BIG head.

All in all, a great product!  I now have them in almost all colors offered!