GY Dura trac. I used them last winter and they were very good. 325/60/20 on F250 CC. I did not have any sway loaded or unloaded. Super traction on everything-wet slush with ice underneath, packed snow, untracked snow, thawing dirt roads, rain. I can't wait to get them back on, I took them off in April, I think they are a little soft, the warm weather and roads were causing a little wear. I have Toyo Mt right on now and it is a very different tire comparing the 2.