They claim wearing headgear will make players more aggressive , leading to increased head injuries ; helmets have not been tested properly and will not prevent concussions ; and .
Helmets are n't required in college women 's lacrosse .
They claim wearing headgear will make players more aggressive , leading to increased head injuries ; helmets have not been tested properly and will not prevent concussions ; and because helmets are n't required in college women 's lacrosse .