Clarks Men's Koval Oxford 100% Leather Rubber sole Casual and comfortable, Clarks 'Koval' lace-up will get you through the day. Full-grain leather upper offers breathable wear to keep your feet dry and odor free. Removable OrthoLite footbed absorbs shock to reduce foot and leg fatigue. Stable rubber outsole provides long-lasting durability and traction. Cement construction creates a lightweight, flexible bond without twisting.