The Yokohama BLUEARTH-4S AW21 is an all-season tire designed to offer a balance between summer and winter tire performance. Its rubber compound is infused with micro-silica, maintaining flexibility and grip in both hot summer conditions and cold winter temperatures. The tire features large shoulder blocks for enhanced lateral stability and cornering on dry roads. A central circumferential groove and divergent V-grooves efficiently channel water and snow away, improving performance in wet and snowy conditions. Thin through grooves enhance the 'blade effect' for improved braking, traction, and stability on snow, while also aiding water and snow drainage. The tread pattern includes an optimized arrangement of straight 'all season' slats that boost the 'blade effect' on snow and maintain tread rigidity on dry surfaces. Unlike dedicated winter tires, the BluEarth-4S has an extended tread life for better dry road performance.