Nokian W240. The 240 is the number of carbide studs per tire. There used to be a 180 for less money. I've ridden the 240 for thousands of winter miles. Never a flat and I only lost 2 studs in several years. As secure on ice as riding on dry pavement. I have to warn you they are noisy on dry pavement. By spring I'm glad to go back to standard tires. Well worth the money.