They do really well in sand and mud. I mean "lean the bike over and it will still grab in the mud." But when you hit some of the harder ground, it's still grippy but it eats the tires up fairly quickly. Par for the course I guess. Overall, great tire. Gonna get about 20 hours out the rear but I imagine I would get more if I were just riding in the soft stuff. Oh, and the roost is amazing; if you want to create a force field behind you, you need this tire!!