Puffy, spongy Guardian Caps could help curb NFL head injuries

Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post

Why Chiefs players are wearing special foam caps over helmets

Padded helmet cover shows little protection for football players - Scope

NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports

NFL hopes to reduce head injuries with helmet experiment

Guardian Cap debuts during minicamps in effort to reduce avoidable head contact

NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic

Here's why some Patriots players are wearing caps over their helmets during training camp

High school football teams go soft in the fight against brain injuries