Features of the Keen Men's Wild Sky Mid Waterproof Boot Speed hooks for easy lace adjustment Removable PU Footbed with arch support for long-lasting comfort PU Midsole delivers resilient cushioning Keen. all-terrain rubber Outsole for Higher-traction grip Non-marking rubber Outsole leaves no trace 5mm Multi-directional lugs for traction Full-length nylon Board-lasted construction for added stability KonnectFit heel-capture system for a locked-in feel Keen.dry waterproof, breathable membrane Eco anti-odor for freshness Environmentally preferred premium leather from lwg-certified tannery Waterproof leather and Performance mesh Upper Breathable mesh lining