Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
What are those funny-looking soft caps on NFL helmets during camp?, Sports
Padded helmet cover shows little protection for football players - Scope
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Steelers debut new, safer helmets for off-season training
Guardian Caps NFL: What player positions are required to wear them?
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Guardian Caps debut at NFL training camps around the league
Guardian Caps Guardian Sports
What are Guardian Caps and how are they helping football teams?
Cowboys seen wearing protective, NFL mandated Guardian Caps at OTAs
NFL players wear Guardian Caps to reduce head trauma during training camp
The story behind those soft-shell puffy Guardian Caps players have been wearing
NFL training camps: Guardian Cap players are wearing over helmets, why
GUARDIAN CAP DEBUTS AT TRAINING CAMPS LEAGUE-WIDE