The safety shoe that has no boundaries. Break new ground in the Frontier, the executive safety shoe that literally has no boundaries. It's made with the same care and attention to detail associated with high end luxury shoes. Brazilian full grain leather adds to the stylish look. If you're looking for a shoe that fits every occasion, it's time to cross over to the Frontier. Upper: Full grain leather. Outsole: TPU. Midsole: PU comfort pads. Footbed: Hydro-Tec® Comfort insole with leather toplayer. Fit: Normal. Sizes: 39-48.