1. CST 2. Electric shock prevention, 3. High quality 4. Rubber Characteristics: antiskid, electric shock prevention, pierce resistance, ... retardant, heat protection and break resistance.Material: Polythene rubber, steel cap and steel inner sole.Bottom of steel ... China standard GA6-2004, by national fire-fighting equipment quality surveillance test center. NameValueMaterial1. Upper: Polythene Rubber2. ...