Why always a blue ring?

[Sin City]

so you're saying it wouldn't be distracting?

it probably would.. but a good fight is a good fight.

[The Scientist]

Theres something behind it and Im going to figure out exactly what it is one day. rocky 3 had a yellow ring

Only women would be concerned about the coordination of colors in a Boxing ring lol, I kidd. Who knows? It could be something as simple as the sky blue color being gentle on the eyes, a Boxer getting popped in the head throughout a bout would need any aid he can get when his vision starts to get blurry. Maybe it's nothing special, just standard like vanilla.