knobby tires

Are they worth it/ do they really work on sand or soft dirt?

 

They must work, all mountainboarders use them, I ordered a set of these MBS T3.

The design of the T3 tire builds upon the tried and true performance of the T1 by using similar tread elements in new ways. The result is a great new tread with increased durability and multi-terrain functionality. Split Center Bead modeled on traditional T1 bead. This design element combined with a flatter profile puts more rubber on the ground. This increases overall durability as well as traction on pavement. Center Channel helps to channel water in wet conditions. T3 Knobs provide excellent grip in soft terrain such as loose dirt and wet grass, or on harder terrain with low tire pressure.

 

Thanks man but I was referring about the 7in knobby that Evolve has.