MQ,
The "Extreme VFT" refers to a bow model (They replaced the Extreme Solo for this new improved model).......the VFT part refers to the "Verticle Force Technology" which is found on that model as well as the Patriot. This in a nutshell means that the limbs are swept back into an almost parallel position at the draw, with very little overall limb tip travel from rest......upon firing the limbs move in a verticle plane cancelling out each others energy rather than forward resulting in more limb tip travel and recoil. This "VFT" results in a much smoother , recoil and vibration free shot VS conventional limb styles.
To a degree the entire BowTech line benefits from this VFT , but the "Patriot" and "Extreme VFT" are the models built around this principle.