This is a V-Guard Universal 4-point Chinstrap. The last picture and description below are taken directly from the MSA website. Any questions, please reach out to me!

MSA GA90047 V-Gard Universal 4-point chinstrap

This chinstrap provides additional helmet retention; however, it may not retain the helmet under all circumstances such as after an impact or during a fall. Use ONLY on MSA 4-point suspension protective helmets, Super-V® helmet, or Vanguard™ helmet.

Features:

Textile: Polyester webbing

Color: black strap OEKO-TEX® certified and grey male buckle for a quick identification

Adjusters for better size setting

Compatible with helmet-mounted ear defenders

No metallic parts for a use in electrical applications