Goodyear Storm Welt Construction. Cotton Drill Vamp Lining. Removable Polyurethane Footbed on top of a Poron 4000 Comfort Cushion Insole. Rubber Midsole, Engineered Composite Shank, Polyurethane Black 90 Comfort Sole. Special Features: ASTM F2892-11 Standard Specification for Performance Requirements for Soft Toe Protective Footwear (Non-Safety / Non-Protective Toe).