Nubuck sueded leather with durable pigskin upper. Permanent direct-attach molding seals out water. Advanced 3-zone Aerospacer® lining with breathable cushion layer keeps feet dry and comfortable while preventing mildew. Wolverine Compressor™ midsole combines with removable 3-layer footbed to absorb 50% more shock and return 30% more energy for all-day performance. Fiberglass shank stabilizes foot, weighs 75% less than steel and reduces fatigue. Steel toe rated ASTM F2413-05 M I/75 C/75 EH.