Safety boots Electrical resistance (between 0.1 and 1000 Mega Ohms). BGR 191: Adjustment for orthopaedic shoes according to German standard BGR 191. The shoe is tested with orthopaedic soles adjusted in accordance with EN ISO 20345 Energy Absorption at the heel (tested at 20 Joules). HRO: Heat-resistant sole component tested at 300 °C. IEC 61340-5-1: Electrostatic discharge resistance (ESD) less than 35 megaohm. S1: Shoe made of leather and other materials, excluding all-rubber or all-polymer shoes + closed back + SB + A + E. S2: S1 + WRU. SB: Shoe with toe protection tested with 200 J impact and 15 kN compression (with oil resistant sole). SRB: Non-slip ceramic floor with glycerol. WRU: Water resistant upper part; complies with IEC 61340-5-1 (ESD). Double absorption zone. Water repellent. Antistatic properties. Heat resistant sole. Oil resistant sole. Breathable insole. Padded rod.