Guardian Cap used by football teams to protect against head injury
Guardian Cap - Soft-Shell Helmet Cover for Football and Lacrosse
The impact of 'Guardian Caps' on player safety
UT hopes helmet caps can curb concussions
The Guardian Cap is the leading soft shell helmet cover engineered
Guardian Cap - Soft-Shell Helmet Cover for Football
Padded helmet cover shows little protection for football players
Guardian Cap - Soft-Shell Protective Helmet Cover
Guardian Caps Guardian Sports
NFL exec suggests Guardian Caps worn to protect players during