Most often, it has to do with superstition. Some players will not have their helmets cleaned during the season. Which doesn't sound like a big deal, except that they're also handling the pine tar to improve their grip, which ends up making the helmet quite dirty after several games. If the helmet is actually broken, it's not allowed to be used in the game.
Rawlings
Batters wear helmets, catchers wear face masks.
You can, but most players don't. If the helmet is too big, wearing your cap under it is a good way to make it fit better though.
Its not that they put pine tar on their helmets on purpose. Its from handling the bat with their gloves, then both adjusting/taking off their helmet. So it just transfers from bat to helmet via the glove. Sure they could clean their helmets after a game, but I'm sure its a superstitious thing with many baseball players to not clean the helmet. I'm sure you've seen tons of ball players with extremely dirty helmets... Also... ball players ''adjust'' the amount of pine tar on their gloves for preference by touching their helmet to take some of it off.
Football and aviation (pilot) helmets were constructed of leather.
Professional baseball teams only wear helmets when batting and they don't have designated colors. Several baseball players wear red helmets when batting.
Chin straps come in handy by securing a helmet to the head. The are used for baseball helmets, football helmets, combat helmets, hockey helmets, and motorcycle helmets.
no, because this could be used as a form of cheating.
Most football teams do not put the US Flag on their helmets. It is too likely to be damaged, scratched and dented, not a good sign of respect.
Rawlings
Schutt sells helmets for softball, baseball and football. The company also offers helmet paint and gear. More information about the different helmets can be found on the Schutt's website.
Batting helmets.
One of the following three things: Carbon Steel, Stainless Steel, or Titanium.
Unless you are "fixing" a faceshield or a visor, Helmets cannot be repaired. If it was in an accident, it's "used up" Buy a new one.
Mountain bike helmets are better than dirt bike helmets
You have to have baseball helmets, two cans for each, LED lights, and cardboard!
It depends what type of racing they are doing. In a Time trial there are specific Aero helmets that many prefer. In touring a long distance road riding a light comfort helmet is preferred it's very dependent and also has to do with preference.