The HY80 Replacement Gel Cushions consist of a soft and thin polyurethane skin filled with silicone gel to help enhance comfort. They are compatible with the 3M™ PELTOR™ WS™ ALERT™ XPI, 3M™ PELTOR™ WS™ ALERT™ XP, 3M™ PELTOR™ WS™ ProTac XPI, 3M™ PELTOR™ WS™ LiteCom Plus, 3M™ PELTOR™ CH-3 Industrial headsets.