Originally developed as a hard hat liner for use by the oil field workers working on the North Slope pipeline in Alaska. There is a flap that covers the face with the exception of the eyes. It can be folded out of the way to the back of the neck and held in place with hook and loop. The insulation is our Lamilite. The shell and lining fabrics are denier nylon. Can be worn as is, under a hard hat, under a hood or for sleeping. The front and back give excellent protection for your neck. Completely washable