Leather upper features DRI-LEX lining a steel shank and a dual density polyurethane outsole. Its Poron Permafresh insole is lightweight foam cushioning that fights odor as well as microbial and fungal development. Add an Aeroglide DRYZ footbed for heat and moisture control and you have an excellent environment for your foot. Electrical hazard tested to withstand applications of 14,400 volts at 60hz for one minute without leakage.