Part of the NFL’s safety experiments to reduce head injuries is the expanded use of the padded helmet caps NFL players have been seen wearing during training camps this summer.

All offensive and defensive linemen, linebackers and tight ends are required to wear the Guardian Caps at practices through the second preseason game. This covers the part of the season NFL studies have shown has the greatest concentration of helmet impacts.

Several NFL teams tested the caps last year and the league’s competition committee mandated all teams use them this summer.

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