as a guy who does orthopedic bracing for a living, i can tell you that the reason UT's O lineman wear those DonJoy Defiance "ACL" braces is more a matter of philosophy on the sports medicine team's (head MD, head trainer, head coach) part than anything and they are a preventative measure. that particular company is used by a ton of SEC teams and the SEC i think even has a contract with them. DonJoy. find em at djortho.com I know that's what alabama and auburn use because i know the rep who fits them. I got my BS in athletic training from Troy and our head trainer wasn't a big brace guy at the time. i have fit a lot of these and i never hear lineman complain that they slow them down. helpful????