The Super Swamper Thornbird Tires are an amazingly Versatile tire. The highway contact area in the illustration shows the tread on hard surfaces. The Three Stage Lugs on the sidewalls do not touch highway surfaces but as soon as the tire gets into mud or snow the sidewall lugs provide decisive traction in forward or reverse. Fiberglass belts under the tread and polyester body plies contribute to a really smooth comfortable ride. Super Swamper Thornbird Tires design comes close to being two tires in one... a revolutionary design that has earned its place as all-terrain legend that can cross-over to the highway with ease.