Multi-layered structure Using different rubber compounds in the multi-layered structure can affect the different characteristics of the tire. The Nokian* Intelligent UHP Silica used as the top layer, or tread compound, is especially tailored for hard use and high speeds; it ensures that the feel for the road remains predictable under all circumstances. The interim layers below the tread surface consist of a nano silica compound with small molecules. This unique combination makes the tire much more responsive to steering than traditional rubber compounds. The bottom layer of the multi-layered structure is an especially rigid rubber compound that reduces the rolling resistance and heat generation of the tire. Lower heat generation increases the tire's durability, and low rolling resistance translates to lower fuel consumption and less environmentally harmful emissions.