This is a genuine Team Mutiny JT woven strap, modeled after the original JT Prostraps. JT will probably never make these again.
Fits all Proflex, Proshield, Proteus, Vidar, nForcer and Flex 8 masks.
Combo with a frame to give your goggle a custom look:
https://paintballretro.com/search?q=proflex+frame&options%5Bprefix%5D=last