Winter Sottozero 3 Run Flat tires are Pirelli's third generation of Sottozero (Italian for below zero) Performance Winter / Snow run-flat tires developed for the drivers of premium, high performance vehicles facing challenging wintertime road conditions as they drive their cars year-round. Winter Sottozero 3 Run Flat tires feature Pirelli's Self-Supporting Run Flat Technology that enhances safety and convenience by providing temporary extended mobility in the event a puncture allows complete loss of air pressure. Pirelli's Self-Supporting Run Flat Technology allows tires to literally "run flat" for up to 50 miles at 50 mph (80 km at 80 km/h) unless otherwise specified by the vehicle manufacturer for Original Equipment tires.The Winter Sottozero 3 Run Flat was developed with the philosophy that winter / snow tires must perform in a variety of unpredictable weather conditions. Designed to provide traction and handling in cool, cold, dry, wet and wintry conditions, Winter Sottozero 3 Run Flat tires are designed not just as snow tires, but as seasonal tires suitable for the cold weather and freezing road conditions.Winter Sottozero 3 Run Flat tires use an innovative compound with specialized polymers that improve the tread rubber compound's mechanical, thermal and dynamic properties. The compound is molded into a directional pattern that features an enlarged contact patch comprised of arrow-shaped center blocks and more rounded shoulders to expel water and slush. High-density 3D sipe technology improves braking performance and snow-to-snow traction.The tire's internal structure includes twin steel belts reinforced by spirally wrapped polyamide that enhances thermal stability and makes the tires less sensitive to changes in road and air temperatures. Pirelli's extended mobility solution is made possible by their MIRS computer-controlled robotized manufacturing system, a production process that assures consistency in the application of the additional sidewall reinforcements that provide the self-supporting run-flat capability.Winter Sottozero 3 Run Flat winter / snow tires meet the industry's severe snow service requirements and are branded with the three-peak mountain snowflake (3PMSF) symbol.Install Pirelli Winter Sottozero 3 Run Flat tires in sets of four only.Due to the traction capabilities of the Sottozero 3 Run Flat tires, Pirelli recommends using them only in sets of four to provide the best handling characteristics and tire performance. Though they cannot be labeled as run-flat tires, tires branded with MOExtended or MOE on their sidewalls offer run-flat-like characteristics by delivering limited temporary extended mobility after a puncture results in complete loss of air pressure. Because MOExtended or MOE tires do not have the same speed and distance endurance of conventional run-flat tires, they should not be substituted in any situation where a conventional run-flat tire is required. To confirm what your vehicle needs, check our Original Equipment tire listing for your year, make and model or see your vehicle owner's manual. Related Information: What is the three-peak mountain snowflake symbol (3PMSF)? | Learn more about MOExtended/MOE tires here.