Why do NFL players wear skull caps?

Why do NFL players wear skull caps? What is the Guardian Cap? The Guardian Cap is a soft, padded outer shell that is worn around the outside of players’ helmets. The NFL says that they can reduce concussions by up to 10% if one player involved in a collision is wearing one of them and up to 20% if both players involved in a collision have them on.

What is the Guardian Cap? The Guardian Cap is a soft, padded outer shell that is worn around the outside of players’ helmets. The NFL says that they can reduce concussions by up to 10% if one player involved in a collision is wearing one of them and up to 20% if both players involved in a collision have them on.