Dunlop Devon full safety Affordable waterproof solution Easy slip on design Easy clean profile S5 certified The S5 classification is the most stringent category with respect to protective features for safety footwear. Unique for the S5 classification is that the boots are equipped with a protective toecap and midsole and a cleated outsole. Other protective features include slip resistance, antistatic properties, energy absorption of the heel region, resistance to fuel oil. The boots are tested and certified in accordance with the EN ISO 20345:2011 standard.