The men's Red Wing Classic Chukka Leather Boots have an oil-tanned leather upper, which is water, stain and perspiration resistant. Fastening with a lace-up closure with metal eyelets, the lightweight chukka boots have a Goodyear welt construction. They're set upon Red Wing's signature 'Atlas Tred' polyurethane outsole, which offers excellent traction and under-foot comfort. - L.M. Upper: Oil-Tanned Leather. Sole: Polyurethane.