Armstrong's SKI-Trac PC is a studless winter tire that's designed for use on passenger cars and features a uni-direcitonal tread pattern that enhances traction and handling performance on icy, slushy, snowy, and frozen roads. Optimized 3D sipes bite into the road to improve handling while also helping to reduce braking distances, and the SKI-Trac PC's four circumferential grooves drain water, slush, and snow out of the tread to reduce the risk of hydroplaning on slippery roads.