With a dual-density liner, the CCM TACKS 70 hockey helmet offers a lightweight design and top-notch protection.The helmet's ventilated shell keeps your head cool while the Easy Flip Clip adjustment on the side allows for the perfect fit. *Scientists indicate that brain injuries and concussions are mainly due to linear and rotational accelerations of the brain. No hockey helmet can prevent or eliminate the risk of head injury, including concussions.