No Stickers will not weaken your helmet, put as many on as makes you happy.
Yes they do depending on the stickers
If you like.
It is a warrior helmet and two spears that are crossing each other.
The Stickers on the Stanford Cardinal helmet is a large red S with a green California Redwood in front.
The stickers are small axe blades, representing the axe that is given to the winner of the Stanford/Cal game each year.
Yes. They are fully ready and prepared for players to wear as soon as try get them.
2009
Much research shows that there is no problem with have stickers on any form of helmet such as ; motor cycle helmets, bmx/shateboard helmets and any other form of crash helmets.
http://www.helmethut.com/College/Michigan/moorhead.html
Each player will bring helmet stickers from his school/team and give them to other players on the all-star team to wear on their helmet. I guess they do this to show respect to the other players/schools from their all-star team.
Steven Gerads helmet