I just ordered a set of Goodrich all-terranes and they now have 2 ply sidewalls instead of the 3 ply sidewalls as in the past. The tire dealer looked up mud-terranes and they are the same. I have used these in the past due to the sidewall since most of my flats were rock cuts or cactus punctures in the sidewall. With the 3 ply I had very few flats. So no more Goodrich tires for me.