If we were to classify the Durano S tire, we'd say that it is a very durable racing tire. Reason being, it rolls too fast and handles too well to be catalogued as a training tire. Basically, you have high performance training tires and you have race tires. The Durano S lives somewhere in between the two categories.
The dual density compound grips and corners well, it has high shear strength, so it will hold up under abuse and heavy mileage. Underneath the tread is a strip of Schwalbe's Raceguard to help protect the tire carcass and tube from road debris and prevent flats. Raceguard material is very flexible and will not inhibit the tires performance.
While not quite as durable as the standard Durano, the Durano S offer the rider higher performance worthy of being called a race tire. And as a race tire, it is one of the most durable available.