The Mitzi mid cut walking boot features a high performance waterproof and breathable membrane, supportive cushioned collar and tongue, and protective durable toe and heel guard. Designed to fit your foot comfortably, they also make use of an arch stabilising and supportive steel shank. Upper: Mesh, PU (Polyurethane). Lining: Mesh. Insole: EVA. Outsole: Rubber, TPR. Fabric Technology: Breathable, Waterproof Membrane. Ankle Support.