Military issue, stretchy polypropylene neck gaiters.  Brown in color and made of a 90% Polypropylene 10% Lycra blend for warmth and flexibility.  Keeps your neck warm like a scarf, without the hassle of tying and tucking, and can be pulled over the head to act as a hood for those piercingly cold days in the field.  New, military surplus item.  Limited quantities.