The #312 have a heel guard for extra ankle support, plus the safety and comfort features that Blundstone is known for. Features •Black waxy leather upper with padded collar and tongue. •XRD® Technology in the heel strike zone of the midsole for supreme impact absorption. The PU footbed is also anti-bacterial, breathable and washable. •A TPU outsole that is oil, acid and organic fat resistant. This outsole is also heat resistant to 140°C.