Originally Posted by MadcapMaxie
It's the circumfrance of the fist with abit of the thumb included. For someone who is 6'6 it's actually quite small, there are Middleweights with 12" fists. Sonny Liston despite being 4 inches shorter had 15" fists.
Liston had extremely big hands for anyone.
Do you even need (strong) biceps and triceps with straight punches as you can get power from the legs?
Only in clinches some arm strenght might be nice.