Article Photos: Oklahoma football: Bronson Irwin explains why linemen don't wear sleeves

COLLEGE FOOTBALL: Lane Johnson (69) and Bronson Irwin (68) stretch during spring football practice for the OU Sooners on the campus of the University of Oklahoma in Norman, Okla., Monday, March 5, 2012. Photo by Nate Billings, The Oklahoman

COLLEGE FOOTBALL: Lane Johnson (69) and Bronson Irwin (68) stretch during spring football practice for the OU Sooners on the campus of the University of Oklahoma in Norman, Okla., Monday, March 5, 2012. Photo by Nate Billings, The Oklahoman