Named after the longest highway in the United States, I-90 boots are built for the Long Haul. Featuring signature comfort and abrasion resistance, these boots are built with a TPU lug outsole that is 3x more abrasion resistant than traditional rubber outsoles. The I-90 Rush Max takes this collection up a notch with our superlight EnergyBound™ Max midsole that provides our most responsive cushioning, for maximum performance and comfort all day long by absorbing shock and returning energy.