Cooper Discoverer AT3 4S with Adaptive-Traction Technology grips the surface, rocky or smooth, under the most severe weather, rain or shine. This tire is specially designed with snow groove technology that traps snow in the tread to provide superior snow-on-snow traction. It also has Aqua Vac Channels which are uniquely shaped, deep center grooves that improve the tire's resistance to hydroplaning. Its Secure-grip All-Terrain design provides greater off-road driving capability and improved wet/dry traction. The zigzag Micro-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.