-Heat resistant outsole (HRO): The outsole resists high temperatures up to 300°C. -Waterproof (WR): Waterproof footwear prevents liquids to enter into the shoe. -Cold insulated (CI): Cold insulated (CI) safety shoes keep your feet warm. They are worn in cold environments. -DGUV BGR 191: These shoes are suitable for orthopedic insoles and orthopedic alterations. Certified according to BGR 191. -Metal free: Metal free safety shoes are in general lighter than regular safety shoes. They are also very beneficial for professionals who have to pass through metal detectors several times a day.