NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
First QB helmet designed to help reduce concussions approved by
NFL hopes to reduce head injuries with helmet experiment
Valley News - Woodstock, Dartmouth among proponents of soft-celled Guardian Caps for football
What is the NFL Guardian Cap? Will it do anything to reduce concussion? — Dr. Mark Heisig
Guardian Caps', NFL's Most Recent Attempt At Preventing Head
Guardian Cap: What are and why the NFL asks this safety measure in
Guardian Caps: Why Some NFL Players Are Wearing Them In, 52% OFF
IJERPH, Free Full-Text
Ban on helmet covers sparks controversy
Guardian Cap: What are and why the NFL asks this safety measure in
These puffy helmet caps are the next big thing in NFL player safety, National Sports
Guardian Cap: What are and why the NFL asks this safety measure in
What is a Guardian Cap? Meet the NFL's newest safety measure
Guardian Caps Guardian Sports