Rugged Toe Bar for Added Life in Toe Area. Inner Liner Aids Putting on and Removing Easily. Removable 3/16" Thick Inner-sole for Added Comfort. Rugged Self-Cleaning Outsole and Shank for added Traction and Support. Heel Kick to Aid Removing the Boots Easily. Commercial Grade Boots: Made of High Quality PVC Material. Soft, Strong, and Comfortable. Resistant to Many Chemicals and Acids.