Named after the longest highway in the United States, the Wolverine I-90 is made for long hours and many miles. The I-90 features a highly abrasion resistant TPU outsole which lasts 3x longer than other boots, and is resistant to splitting, chemicals and oils. Premium waterproof full-grain leather upper for premium look and feel. Breathable waterproof membrane with moisture wicking mesh lining. Removable Dual-Density PU EPX anti-fatigue Footbed. Advanced Comfort PU Midsole. TPU SR Lug outsole that is 3x more abrasion resistant. Durable direct attach construction. Nylon shank provides extra strength. Backed by Wolverine's 30 day comfort guarantee.