Underwear? Check. Hat to match? You know it. Dirty Boxer expands beyond boxer briefs and compression shorts by adding new Dirty Boxer headwear to the company’s expanding range of Mixed Martial Arts fight gear and clothing. Staying in tune with the black and lime green color combination found on the matching underwear, this flat bill 210 FlexFit hat helps keeps your head in check with a stretch-fit finish. To hell with keeping it clean, it’s time to fight dirty.