The Blackrock Yukon Waterproof Composite Boot features a waterproof leather upper with a sewn‑in membrane, lightweight composite toe and midsole protection, a heavy‑duty bump cap, and a PU/rubber sole that is heat resistant to 300°C, anti‑slip, anti‑static and fuel oil resistant, with a YKK side zip, energy‑absorbing heel and full EN20345:2022 S7S SC HRO FO SR certification.