The Ozone R&D Team is obsessed with the improvement of our entire range, but the Buzz series receives extraordinary care and attention during the development process. The Z3 was, in many ways, one of the best paragliders that we have ever produced, and is the wing that several of us at Ozone choose to fly in our free time. Our mission for the Z4 was to retain the incredible balance of comfort and agility that made the Z3 one of our all-time favorites and add some of the performance enhancing design features that have trickled down from the Ozone Performance Project. The Z4 has now benefitted from much of what we have learned from our highest performing wings, such as the Enzo and R12. For more information, see http://flyozone.com/paraglider....s/en/products/glider