The Winter Sottozero 3 is Pirelli's third generation Sottozero (Italian for below zero) Performance Winter / Snow tire developed for the drivers of premium, high performance vehicles who will face challenging wintertime road conditions as they drive their cars year-round. The Winter Sottozero 3 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 tires are designed not just as snow tires, but as seasonal tires suitable for the cold weather and freezing road conditions.Winter Sottozero 3 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 road and air temperature changes.Winter Sottozero 3 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 tires in sets of four only.Due to the traction capabilities of Winter Sottozero 3 tires, Pirelli recommends using them only in sets of four to provide the best handling characteristics and tire performance. Related Information: What is the three-peak mountain snowflake symbol (3PMSF)?