The Discoverer AT3 4S is Cooper's On-/Off-Road All-Terrain tire designed for the drivers of pickup trucks, crossovers and full-size SUVs looking for a tire that blends the off-road grip they need with the on-road comfort they demand. Engineered to deliver traction on any surface it may encounter, the Discoverer AT34S combines on-road manners with off-road capability and provides confident light snow traction that meets the tire industry's severe snow service rating requirements and earns the three-peak mountain snowflake (3PMSF) symbol.