9" calf high boot features optional Quick Release zipper for easy on and off functionality and a steel toe that meets and/or exceeds ASTM F2413-11 standards. Constructed of full-grain black leather, triple ribbed padded collar, a padded tongue and Nappa leather lining provide comfort everywhere.. Slip Resistant - MARK II Machine tested slip resistant on oil, acid & water.. Anatomic Support System - Redbacks unique Anatomic Sole cradles the foot to reduce arch sagging and prevents foot strain, fatigue and related leg and back pain.. Electrical Hazard Safe - Our boot meets and exceeds ASTM F2413-11 standards for Electrical Hazards.. Impact/Compression - Steel Safety Cap meets and exceeds ASTM F2413-11 standards for Impact & Compression.. Commonly used by: Police, Fire, EMT/EMS, Auto Tech.