NFL on CBS - The NFL implemented a one-helmet rule back in 2013 for player safety.
Will Bengals consider white helmet, with alternate colors allowed?
Inventors Digest August 2016 by Inventors Digest - Issuu
Bengals jersey redesign will get boost as NFL changes one-helmet rule
Look: Cincinnati Bengals Petitioning NFL to Change Uniform Rules - Sports Illustrated Cincinnati Bengals News, Analysis and More
Cincinnati Bengals Riddell Speed Replica Helmet - Alternate – Green Gridiron, Inc.
Bengals Asking NFL to Change Alternate Helmet Use Rules