They are rare but they do exist. Discuss. Bj Penn comes to mind , even in his current shot state he cant be ko'd Or even knocked down for that matter. Jds has a decent chin as far as mma heavyweights go, hes only been down once and nelson has been down a few times and only ko'd once. Hunt had a good beard in his prime but his chin is sort of shaky now, still better than most mma hws though.
Penn's chin is certified steel. Never been down in his career, and has absorbed a tremendous amount of punishment especially in recent fights.
The only time I ever seen him rocked is the last fight against Rory. He was visibly stumbled. But the amount of punches he took from Diaz and Rory, without even dropping to a knee, is outright amazing.
Poster above is just a moron. Penn is the Chuvalo of MMA. He even fought a debastating striker at HW and still has never been decked. Hunt has eaten a flush high kick from CroCop. It took a square haymaker to the point of the chin from a murderous puncher and a devastating spinning kick from a 240-lb killing machine to drop him in those fights. Rampage had an underrated chin. He's been put out, but by ungodly barrages
Rampage as well has an excellent chin. He's absorbed some serious shots in his time, the only ones that really pummeled him was a prime but equally juiced up Wand, and then Shogun with knees to the body I think when talking about good chins though, its easy to slate the heavier fellas for getting ko'd. But the reality is the bigger fellas just hit a lot harder, hence how little dudes always seem to have chins.