It means that the helmet with the green dot has the radio equipment in it and only the QB may have that.
Yes, but only quarterbacks and one select team leader on the defense can have one.
Wiring is only for the QB.
Don't know for certain, but I was told that the helmets with the green stickers were those with radio communications. And since the NFL would only allow one of those helmets at a time on the field, they designated them with a green sticker.
Yes, college players are allowed radio helmets. However, there is only one radio helmet allowed on the field per team during a game.
The green circle means Radio Equipment installed. prior to 2008 only Quaterbacks. But starting in 2008 certain defensive players also have it.
Professional baseball teams only wear helmets when batting and they don't have designated colors. Several baseball players wear red helmets when batting.
Yes, not only for aesthetic but also safety purposes.
Yes, they do but it is only because they want to.
Yes, but only the QB on offense, and the defensive captain, which is typically the middle linebacker.
In the NFL as of the 2007 season, only the quarterback is allowed to have a listening device in their helmet.
Yes, I play football at the Pro level and there are many skilled position players as well as special teams players that only wear shoulder pads and helmets.. In practice we sometimes only wear shoulder pads and helmets we call it pro-pads we also wear this during training camp a lot and when we are not going to hit full speed.