Dunlop Protomastor safety Functional food processing work boot Waterproof to give protection in wet conditions Oil resistant, SRA rated outsole for perfect grip Slip resistant to assure safe working conditions SB certified The SB classification is the entry level category with respect to protective features for safety footwear. These features include a protective toecap and a slip resistance of minimal SRA or SRB. The boots are tested and certified in accordance with the EN ISO 20345:2011 standard.