I had these installed on my car and have now driven with them in the snow and ice in michigan, and they should not be used under these conditions. I drive carefully in inclement weather, if theres more than maybe 2 or 3 inches on the ground you will slide, at least I did and I was going less than 25mph at the time. Even in patchy icy conditions the tires on ice would not grip. I even thought mybe it was my driving but they were just as bad with my husband driving the car. I cannot wait to get these off my car. There is a chance my tires are the dud and its a fluke but I do not agree with the "all season" rating unless you live someplace with little or no winter snow and ice!