The 4-point chin strap that can be easily and quickly adapted to your individual needs: 3M™ standard 4-point X5-S4PTCS1 chin strap. It is available as an optional accessory for the X5500 series 3M™ SecureFit™ helmets. Our chin strap with plastic lock is easy to attach and to use. This provides you with optimum protection and comfort at the same time.