The Blundstone 510 Original Black is one of our most versatile Blundstone boots. It's true black goes with everything! F Premium leather elastic sided boot. Fully removable shaped comfort footbed. Polyurethane (PU) midsole/thermo-urethane (TPU) outsole highly resistant to hydrolysis and microbial attack. Oil, acid and organic fat resistant. Outsole heat resistant to 290 degree. Steel shank - ensures correct step flex point, assists with torsional stability. Extra set of footbeds for fit adjustment. Lightweight and durable.