CLARKS. 26136999. UNRAMBLE STEP. BLACK LEATHER. An update to a customer favorite the Un Seal this slip-on style from our Men s Unstructured Collection that matches workwear looks with top-notch comfort. Its upper is made from soft nubuck and full grain leather and a pair of subtle elastic gores provide a flexible fit. A rubber and EVA outsole offer walkability without adding weight and a removable OrthoLite footbed reduces impact.