ECV Boonie HatThis style of cap has been around a long time. They became popular during the Vietnam war when they were issued to the Green Berets as part of their uniform. These Boonie caps are black and have a ECV patch. They are adjustable so one size fits all. These Clamper Items are offered by the Squibob Chapter Store and are for Clamper members and their widders only, so be prepared to prove yourself a clamper or widder..