UNDR goggle straps work with nearly every mask on the field today. Compatible with but not limited to these masks: JT Flex7, 8, Proshield, Virtue Vio's, GI Grillz, GI Profiler's, HK KLR's, Dye I3, Dye I4, Push.
However they may not fit nor be used in conjunction with all the masks in the industry.
UNDR goggle straps are a standard 9 inches. They are assembled with butterfly ends.
You must insert butterfly ends of the straps into the slot where the existing straps are installed, some goggles may use clips to secure.
Butterfly ends must be completely and fully inserted though the slots for a proper fit and safe use.