As the name would imply, the Open Corsa CX III is the third iteration of this great tire. The big change from the previous version is the compound. The Kevlar SiO2 3D Twin Tread has been replaced with Vittoria's new reference ISOgrip compound.
The ISOgrip sticks better and rolls faster while providing better adhesion in both wet and dry road conditions. It doesn't seem to last quite as long, but this is a premier race tire and any star that burns twice as bright, burns half as long.
At the heart of the tire is the Corespun 320 tpi casing. The casing is made from a poly-cotton blend that has Kevlar woven in to add durability. Kevlar in thread form is soft and flexible, so while offering added protection, it will not adversely affect the handling. The huge thread count of these materials are tightly woven and end up giving the rider near perfect road feedback and a firm but resilient cornering feel. Sandwiched between the tread and casing is Vittoria's proprietary PRB 2.0 protective layer. This strip helps protect the casing from glass shards and general road debris that can wedge into the tread and cause flatting.