I think they are quite popular in the UK, they have the deepest tread I've ever seen and are very heavy (hence I think very thick carcass). Extremely noisy on road so I would recommend as a second set, but I expect they would be as good as you can get for mud/loose soil for the price. They have huge lugs that stick out the sides. I don't know how good retreading tyres is these days, but I expect the glue is pretty strong! Just a retread copy of the Simexs I think.