The Blundstone 510 Original Black Chelsea is one of our most versatile Blundstone boots. Black goes with everything! A favourite with people in uniform from pilots to posties for all-day, all-season, all-surface comfort. Unisex sizing. 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°F. Steel shank - ensures correct step flex point, assists with torsional stability. Extra set of footbeds for fit adjustment. Lightweight and durable. SKU: 510 Blundstone Unisex Classic Boot 510 - Black