From Sperry, the Saltwater Lace Up Waterproof  Duck Booties feature: Waterproof rubber "duck" shell with nubuck leather upper Signature rawhide barrel-tied laces with rust-proof eyelets for an adjustable and secure fit Barrel-tied extra cord lace detail Inside zipper closure Back pull tab Warm micro-fleece fabric lining Non-marking rubber outsole with Sperry's signature molded Wave-Siping technology for traction on both wet and dry surfaces Approx. 5" boot shaft height Approx. 0.50" heel height Imported.