Cooper Discoverer AT3 4S ( 255/70 R18 113T )

Discoverer AT3 4S Snow groove technology Patented saw-tooth technology traps snow in the tread to provide superior snow-on-snow traction. Secure-grip™ all-terrain design Specifically designed 5-rib all-terrain pattern provides greater off-road driving capability and improved wet/dry traction. Micro-gauge™ zigzag sipes Smaller gauge sipes in all tread blocks provide increased vehicle stability and control, while reducing stone retention and drilling. Zigzags create more biting edges for optimal wet/dry traction.