Cooper Weather-Master S/T 2 Winter Radial Tire - 215/70R15 98S Tire only High traction tread design balances winter traction and a smooth, quiet ride. Patented "Snow Groove" Design Technology Provides biting edges for excellent snow and ice traction without reducing tread element stiffness. "D Squared" Sipe Technology (density x depth) enhances winter performance while maintaining excellent wet traction. Tri-polymer blend tread compound specially formulated for excellent winter traction while maintaining wet and dry performance treadwear.