What makes up a GREAT Chin ?

[SOPH~ REP.]

? Is it defense ,technique or just born with dont think you can train to absorb blows or can you can u train for concussions or just to prevent it with precaution

[AlexKid]

how thick the protective fluid is inside the skull, how rough or smooth the inner skull is

I can check for you if you want?

[SouthPawHitman]

Getting hit makes your chin better. When you wake up punch yourself in the head 50 times and before you know it you'll be Hagler

[juggernaut666]

you can certainly train a chin to a certain extent of getting used to taking punches and having the brain rattled.After that its all you. Mental toughness?Well anyone can have that, ive known a few mean guys/tough guys but cant for the life of them take a shot to to the chin/temple. I would argue some genetic capablility there and definatley different skull thickness because the brain doesn't rattle as much inside a thicker skull,and I don't believe head size has much to do with that, its the condensity inside where the brain moves.. To add abilities to take a better punch certainly neck size helps as well as strong jaws and muscle tissue connecting the jaw line.i used to chew gum...anyone do that? lol mental strength is subjective but if you invision you can take a baseball bat I don't think that hurts.Some fighters are just made or born to take better punches than others. shape of a chin is also helpful ,a square chin is proven to take a better punch than a weaker forming one. In the end it depends on who hits you and how and only you know how to measure that if you know what type of puncher has connected with you if this is a personal question ...if its a pro boxing question well statistics/video footage will provide the end opinion of who has a good/great or average chin.

[GodOfBoxing]

Jake LaMotta one of the VERY TOP NAMES here. "Big Cat" Williams -from the Ali fight- picked-up "opposite reputation". Emile Griffith I believe was stopped once only. SRR stopped ONCE only in 201 fights. Hagler never stopped. Monzon never stopped. My friend Marlon Starling -officially- never stopped. Evander stopped all of TWICE.
Probably the first attribute gonna be consistency with conditioning. Boxing a person CAN KO THEMSELF simply by "Not being in good shape". William (Young) Stribling "stopped" but once in his career. Title fight by Max Schmelling and if I remember right ["King of the Canebreakers"] that was a TKO 14-seconds to go in r.-15.
Go to Facebook and interview John TheIceman Scully. He was a 70 bouts amateur not once -stopped- & never "decked". Pro about 45 bouts never decked. Stopped ONE TIME. I believe he never was knocked down Sparring either and he has Sparred some-of his Era's top stars. Scully will enjoy talking these sort of things and he's a respected TRAINER in modern.
Perhaps some of it is "Old wives tails" with the TRICKS to tough up ones JAW. "WILL POWER" I would bet HVY on!