Looking for a modern, durable mud tire that's made in the USA and won't break the bank The new all-season Evolution M/T from is all that and more. Available in sizes from 15- 20with 6 and 10 ply ratings, that includes a high-strength, 2-ply sidewall, Stone Barriers to help protect against damage from sharp rocks and keeps them out of the tire lugs, and Mud Slinger trenches that dispel thick mud and improve grip. Earth Diggers tackle the harshest terrain elements with alternating mud scoops to forcefully tear up loose dirt, sand or thick mud. The Trail Grip sidewall design feature climbers to help grab onto rocks and sticks for your next off-road adventure.