... safety helmet 2.Material:ABS for shell ,6 prong ,knitted chin strap with a PE tray 3.Adjust manner: plug 1 ... headband to fit everyone’s requirements 4. replaceable sweatband & elastic chin strap for wearing comfort 5. accessory slots available for extra ... safety helmet 2.Material:ABS for shell ,6 prong ,knitted chin strap with a PE tray3.Adjust manner: plug4:Colors:red ...