What are the bands some football players wear around their arms at the elbow?

Silent Kninja: What are the bands some football players wear around their arms at the elbow?
What is the purpose of the rubber-band looking things that some football players wear around their arms near the elbow? Is that to improve circulation or something? Please let me know, thanks.

A sometimes football watcher.

Answers and Views:

Answer by makelly1979
its a support band for tennis elbow

Answer by BulldogBlitz
I’m pretty sure it means that player does NOT have a green dot on his helmet. 😉

Answer by more than anime
it can be a brace for tennis elbow or other ailment, to help keep sweat from their hands, to save their skin from scrapes from the turf etc

Answer by Jason F
Sometimes its something wore on the arm where the plays are kept . Middle linebackers usually have to get the signal from the sidelines and look at what the play is and call it.