The Nova is an overmold putt & approach disc that features a firm flight plate and soft grippy rim.
XT Pro is a tough blend of Pro that was originally designed for the Nova. It worked so well, it spread to other models. Grip is off the charts and durability falls somewhere between Pro and Star. XT Pro is more firm than Yeti Pro, and less firm than KC Pro with a unique grip that feels great in the hand, and helps stop the disc quickly when landing.