This boonie is made to current US military specs with an adjustable chin strap that allows a custom fit and provides extra protection from the sun. Adjustable Tactical Hat: This bucket hat with strings meets US military specs and is made of 50/50 nylon-cotton rip-stop with a flexible chin strap and cordlock for an easy fit; Crown has nylon loops for extra camouflage or carrying small items Efficient Design: These sun hats for men feature brass screen vents to keep you dry no matter what weather throws at you and high-quality Bemis seam tapes; The wide brim provides protection from the sun and comes with a built-in internal map pocket High-Performance Bucket Hats for Men: Our outdoor camo hat is perfect for camping, hunting, fishing, hiking, military exercise or as a daily wear Trusted Apparel and Equipment: One of the leading suppliers of uniforms and personal equipment to military, law enforcement and public safety markets, Tru-Spec offers solid and reliable products that work hard, feel comfortable, and look great