The Surly Nate tire has a shred-your-face-off run-over-anything kung-fu grip knobby tread pattern. The casing is round and supple. Tall widely-spaced knobs are siped for added grip and compliance. The knobs' wide spacing means they dig deep and still shed the crap you're riding through. The tread wraps a little around the sides of the tire providing good knob contour even on very wide rims which in turn allows good off-camber traction. Tall widely spaced knobs with siping for added gripMore aggressive tread than the other Surly fat tire optionsTread wraps around to the side of the tire a bit which allows for continued traction while turning