Injection-molded ABS outer shell is rugged yet lightweight, Expanded Polystrene (EPS) liner dissipates impact loads and fortifies helmet structure for a secure fit without compromising comfort, Removable/replaceable comfort liner and cheek pads feature brushed fleece Lycra touch points to absorb and evaporate perspiration, Chin strap features brushed fleece Lycra touch points for comfort and an adjustable strap end retainer, Molded recesses inside EPS interior shell accept select aftermarket audio and communication components, Rugged shield hinge hardware with robust detents allows you to open the shield at slow speeds for increased airflow