IMS 5.0 Hockey Helmet ComboExperience the classic style and appearance you prefer, combined with the necessary game protection. The IMS 5. 0 helmet features a two piece shell design with tool free adjustment and enhanced airflow through multiple vents. Experts indicate that concussions are primarily caused by the brain's acceleration or deceleration, and helmets may not prevent concussions from these forces. Includes Profile II facemask.