The liner of the Tacks 110 helmet features a multi density foam liner with a pro preferred look and developed to help manage a variety of impacts. This helmet can be adjusted without the use of tools and has an easy adjustment on the back for a customized snug fit. The outer shell of the helmet has been designed to maximize protective capabilities. This is a pro preferred look with geometry that helps absorb impacts. Scientists indicate that brain injuries and concussions are mainly due to linear and rotation accelerations of the brain. No hockey helmet can prevent or eliminate the risk of a head injury, including concussions.