These 100% cotton ripstop hats are made to take a beating. Tear-resistant ripstop design helps keep them intact in the field, and the breathable cotton and the vents in the top help keep you cool and out of the sun. The webbing hat-band is good for tucking small items and sunglasses into. It has a chin-strap as well that can keep it on your head or hang around your neck when you don't need it on. These hats are sewn to military specification MIL-H-44105B.