Servus Iron Duke 15in ST Boot - Mens Black 5. Resistant to degradation from agricultural chemicals fertilizers and animal waste the Iron Duke. The PVC blend stays flexible even at colder temperatures critical stress points are reinforced for longer wear and the easy guide along the shaft customizes the boot height. Specifications for Servus Iron Duke 15in ST Boot - Mens: Manufacturer: Servus Gender: Male Age Group: Adults Men's Shoe Width: Medium Color: Black Footwear Type: Boots Activity: Outdoor Footwear Upper Fabric/Material: Polyblend Outsole Material: EH Rated Package Contents: Servus Iron Duke 15in ST Boot - Mens Servus 18801-BLM-050: Iron Duke 15in ST Boot - Mens Black