Ancillary helmet pads had been developed from at least the late 1980s. However, their use voided the warranties and certifications of helmet manufacturers. This position was supported by the US
National Operating Committee on Standards for Athletic Equipment (NOCSAE) until 2013, when it recognized third-party certification for add-on equipment. Guardian was formed in 2010 by the owners of a
materials science company. They initially developed a soft-shelled football helmet intended to replace the hard-shelled helmets of the 1960s, but it did not gain acceptance. This mandate was put into place after discussions with the Competition Committee and the Owners' Health and Safety Advisory Committee, as well as "consultation with [NFL] head coaches". During the 2023 NFL offseason, the mandates on wearing Guardian Caps were expanded. Running backs and fullbacks were added to the position groups required to wear them, while their use was made required for "every preseason practice, as well as every regular-season and postseason practice with contact". Ahead of the
2023 season, the CFL also mandated the use of Guardian Caps during training camp and padded practices for offensive and defensive linemen, running backs, and linebackers. In August 2023, NFL executive Jeff Miller stated on
Good Morning Football that the caps could one day be worn in-game. College football programs were noted for using Guardian Caps in 2023, with
Auburn players wearing them during practices that fall. player
Luke Goedeke (center) wearing a Guardian Cap during a
regular season game in 2024. The NFL began requiring
wide receivers and
defensive backs to wear the equipment during practices in 2024, which left only quarterbacks, kickers, and punters as not being mandated to wear them. Players in those position groups were, however, still allowed to wear them if they chose to do so. During an April 2024 webinar, NFL chief administration officer Dawn Aponte announced that the league decided on permitting players to use Guardian Caps during games if they so desired. The first player to wear a Guardian Cap during any organized game was offensive lineman
James Daniels of the
Pittsburgh Steelers during an NFL preseason game against the
Houston Texans on August 9, 2024. The first player to wear a Guardian Cap during a professional regular season game was running back
Thomas Bertrand-Hudon of the
Saskatchewan Roughriders during a game against the
Montreal Alouettes on August 16, 2024. Several NFL players, including
Josh Whyle of the
Tennessee Titans, wore Guardian Caps during the
2024 regular season. Guardian Sports developed a successor model, the Guardian Cap NXT 2.0, that was approved by the NFL for the 2026 season. It has a sleeker surface which allows for stickers to be directly applied. ==Reception==