Universal slip on arm restraints - One Size Fits Most
These are adjustable and to work properly the length must be adjusted where to not allow any of the drivers arm/hands to be able to get outside of the roll cage/frame in the event of a rollover/accident.
The rings on the end of the tethers  must be attached on the lap belts where when the driver/crew member/safety personel releases the seat belts the tethers release as well when the belts are released so the driver can get out quickly in the event of a accident/fire (the tethers would stay connected to the jacket).