here's a picture: http://www.fushionmag.com/wp-content/uploads/2009/06/transformers-2-josh-duhamel.jpg I dont think it is a shemagh because it looks netted
When I was in the Marines in Kuwait, we had been issued a shemagh of (basically) brown cotton, like a t-shirt material. It was about 4' long and 18" wide. I loved that thing. It would block wind, rain, sand and could be used to clean my face, weapon etc. I always wore it wrapped around my neck.