The Skullerz 8901 Safety Helmet Replacement Chin Strap is designed for compatibility with Skullerz 8963, 8964, 8963-MIPS and 8964-MIPS Type 2 Full Brim Safety Helmets. The safety helmet chin strap easily attaches to four built-in mounting locations on the helmet shell. This adjustable helmet strap secures the helmet to the head and ensures it does not dislodge if the worker falls or is impacted by another object.