The Caterpillar Active Alaska hiking shoe features a Nubuck, soft tumbled leather upper with a cloud pattern or a tumbled grain leather upper. Caterpillar Active Alaska features in addition a nylon mesh lining. With Caterpillar Active Alaska you get a micro-fibre covered, removable, dual density PU sock liner and an EVA mid-sole. Cat? Caterpillar Active Alaska footwear, with slip-resistant T506 rubber outer soles, reduces the risk of slips and falls -- the hazard of low traction surfaces.