KEEN eVent waterproof and breathable barrier keeps your feet dry from the inside and out. Aggressive, non-marking outsole with 4 mm lugs for extra traction. Torsionally stable with extra ankle support, thanks to an ESS shank that holds the shoe in place. Specifications: Weight per pair: 1 lb 12 oz. Uppers: leather, webbing, mesh. Lining: synthetic. Outsole: carbon rubber.