Abstract: An anti-concussion helmet attachment collar assembly includes a cowl body attached to a curved helmet attachment ring segment at its upper end, and to a cowl support ring at its lower end. A circular rolling element bearing is interposed between the bottom of the cowl support ring and the interior shoulder of an underlying central ring, facilitating rotation of the cowl support ring with respect to the central ring. A modified helmet incorporates a flange with keyhole openings coupleable with standoff rivets on the helmet attachment ring segment. A base attached to equipment, such as football shoulder pads, is configured to selectively couple with the central ring during use.