Rothco Thin Blue Line Adjustable Boonie Hat Black One Size. The boonie hat is also adjustable and features anelastic cord which allows it to fit most head sizes (6 3/4 - 7 3/4).Proceeds From This Purchase Benefit Families Of Fallen First Responders. Specifications for Rothco Thin Blue Line Adjustable Boonie Hat: Manufacturer: Rothco Gender: Male Age Group: Adults Hat Size US: One Size Hat Style: Boonie Hat Color: Black Fabric/Material: 55percent Cotton/ 45percent Polyester Design: Thin Blue Line Features of Rothco Thin Blue Line Adjustable Boonie Hat Adjustable Boonie Hat Features Adjustable With Elastic Cord And Plastic Cord Lock Embroidered Thin Blue Line US Flag 4 Screened Side Vents Adjustable Chin Strap TBL Boonie Hat Features Internal Map Pocket Made Of A Comfortable Cotton / Poly One Size Fits Most (6 3/4 - 7 3/4) Package Contents: Rothco Thin Blue Line Adjustable Boonie Hat Rothco 5917: Thin Blue Line Adjustable Boonie Hat Black One Size