do these things even work because now that NFL players can start wearing Guardian caps during regular season games I wanted to look into just how effective these things are and why even the NFL is now admitting that players don't actually need to be wearing them in practice see Guardian caps became allowed for used during practice in 2020 2022 the NFL was requiring all players except for quarterbacks kickers and punters to wear these during contact practices throughout the year but do they actually work well according to the league there was a 52% decrease in concussion suffer by players who wore the Caps this is because they're designed to reduce the force of contact by 10% when a player is wearing it an effect which can rise to 20% if both players involved in the hit are wearing one so I guess every player should be wearing one of these in every game going forward right well it's not that simple for starters some players complain that the Caps are too hot since they cover the vents meant to cool their heads on regular helmets but even the NFL has come out and said that Guardian caps aren't as effective as six new helmets that approv for use this year