Innova says:

The Innova Xero Putt & Approach disc has more range and torque resistance than other straight-flying putters in our catalog. When it comes to getting the disc from your hand to the targeton a straight linethe Xero has your back. Dont worry about it fading hard because the Xero has extreme low-speed stability. Heck, you can even throw a slight hyzer, and itll still stay straight!