The upper leather is black grain leather, which maintains a good fit and is water resistant. The 3D-dry® lining keeps the feet dry and fresh for a long time. The flexible Flexstep® sole is made of polyurethane and absorbs shocks directed at the back and feet. The insole is a removable Sievi Comfort insole that is antistatic and ESD compliant, breathable and machine washable at 40˚C. ESD approved.