I wouldn't say Hearns chin was that weak below Middleweight, Leonard could bang at Welterweight. And Hearns took alot of punishment in the later rounds, and was stopped on his feet more due to exhaustion, rather than his chin letting him down. I think Hearns's weak chin gets a little bit exaggerated, now i know his chin wasn't the best. But people also forget he survived torrid moments vs Roldan, Kinchen, Leonard 2, and was able to overcome those bad moments and win those fights. His chin was definitely the weakest part of his game, but i don't know if i'd go as far as to say it was "glass". I guess i would class his chin as average but fighting heart was a 10 no question.