Adjustable Boonie Hat features removable neck flap / cover for additional sun protection while you go hunting, fishing, camping, or perform other outdoor activities. Easily remove or attach the neck cover with the five snap buttons located on the brim. The Army Boonie hat is fully adjustable with an elastic cord and plastic cord lock to alter the size (fits 6 ¾ - 7 ¾), and an adjustable chin strap to keep the Boonie cap securely in place while worn. Lightweight and breathable 55% cotton / 45% polyester construction provides all-day comfort. Store a map or other paperwork in the internal map pocket. The four screened side vents (two each side) enhance airflow so you can stay cool.