This is a previously-owned, adult-sized, green camouflage hat with a leather appliqué affixed to the front that says “Sludgehammer / Advanced Bio-Technology” (Richardson brand, 100% polyester). It is a trucker-styled cap with a curved peak, a mesh back, and an old-school plastic snapback adjuster in the back (to quickly fit most wearers)… SludgeHammer is an Aerobic Bacterial Generator that fosters the growth of a curative biomat of specialized bacteria right in a septic tank. As the SludgeHammer eliminates waste in the tank, it sends out an endless stream of microbes that keep the soil open and porous.