Tru-Spec Gen II Adjustable Boonie HatThe idea is so simple, why didn't they do it before?..... The Gen. II Adjustable Boonie by Tru-Spec is an upgrade to your standard issue boonie hat. No more size issues, one size fits most! Built for all day comfort from 65/35 poly cotton rip-stop material. Includes adjustable sizing strap in the back, brass screen side vents, adjustable chin strap and a sturdy 21/2" brim. Weighs .23 lbs.