The Mack Octane Zip in black has a combination of electrical HAZARD certification and the performance features of the Mack ADAPT™ Range. We cannot deliver Mack to P.O. Boxes, Parcel Collect or Parcel Lockers. The Octane Zip designed for electricians and construction workers that work on uneven surfaces and can be exposed to electric currents. The zip sides makes them easy to get off and on. APPROVED STANDARDS AS/NZS 2210.3 (Class I SB SRC HRO) EN - ISO 20345 (SB SRC HRO) ASTM F2413 - 11 (M/I/75/C/EH) ADDITIONAL FEATURES eletricalHAZARD ZIPclosure softBOARD™ SIZES 6 - 14 1/2 sizes 6.5 - 10.5 Height: 160mm Weight: 670gms Mack Boots Octane Zip Composite Toe Lace Up Work Boots Black