Clarks Slip on Black Combi Nature 5 Walk The last word in comfort, our Nature 5 Walk shoe blends a casual silhouette with modern technologies. Active Air cushioning uses unique motion-powered pods that activate with every flex of the foot, keeping feet fresh and comfy all day. A nod to Clarks heritage design - crafted stitching on the classic black upper and flecked rubber sole add character to this everyday slip-on.