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 2x Longer Than Other Boots, And Is Resistant To Splitting, Chemicals And Oils. In Addition To Its Stronger Than Ever Outsole, The I-90 Has Additional Wolverine Technology For Long Lasting Comfort. Epx Technology Brings Comfort Closer To The Foot With A Dual-density Footbed. Backed By Our 30 Day Comfort Guarantee, The I-90 Is A Must For Long Days On The Job.