“LaVell Edwards Stadium at Brigham Young University does not allow personal stadium chairs, but seat cushions without pockets, compartments, or covers that are 18 inches or less in width are permitted.”

I’m Going to the Oklahoma State game this week and I haven’t been to the stadium for a couple years and I Heard you can’t bring stadium seats anymore, but that maybe a cushion was allowed. I’m sure hoping so because I had a three level lumbar disc replacement surgery a couple years ago and sitting for a long period on hard surfaces really is not comfortable on my bones anymore.
Can anyone tell me for sure what the rules are?