Lightweight and durable cast polyurethane midsole Rugged, strong and durable with a sporty look. You'll find all these elements in the new Shale trekking family. The seamless upper made of durable material with reflective details provides high visibility and a strong image. A poured polyurethane midsole along with a durable rubber sole provide excellent traction on uneven surfaces. Metal-free. Upper: microfiber and nylon Lining: mesh Outsole: rubber Midsole: cast PU Insole: open-cell PU foam Feature: reflective panels on the upper Fit: wide Sizes: 36-48 Safety standard: EN ISO 20345: 25XL S3, SRC, HRO Protection: fiberglass instep and soft toe protection