Important Note: The AU size is stamped on the bottom of the boots, not the US size. Featuring heavy-duty safety features, the Blundstone #990 Extreme Series is crafted for challenging environments with a 200 Joule Type 1 steel toe cap, providing impact and compression protection for industrial workplaces. Heatproof to 572°F - Designed for intense heat conditions, these boots feature an outsole that can endure temperatures up to 572°F, offering short-term defense against melting and cracking in high-heat environments for enhanced durability and safety. Water, Oil & Acid Proof Upper - The premium black nubuck leather is specially treated for durability against moisture, making it ideal for wet and muddy work settings. Additionally, the outsole is shielded against oils, acids, and organic fats for advanced protection. Slip-Defensive Outsole - The advanced rubber outsole provides exceptional slip defense, featuring a unique tread pattern and high-quality soling material, ideal for slippery and varied surfaces typically encountered in industrial settings. Enhanced Comfort & Shock Absorption - Built with SPS Max - XRD Technology in the heel and forefoot for superior impact protection, along with a luxury, breathable footbed that’s washable and removable, ensuring all-day comfort and stability on the job. Blundstone Extreme Series Work Boots are engineered for the toughest industrial tasks, merging heavy-duty safety with all-day comfort. These boots are crafted with water-durable wheat nubuck leather, treated for extra durability against moisture and chemicals. A broad 200 Joule steel toe cap offers top-tier impact protection, ensuring defense from rolling compression hazards. The slip-defensive outsole is heatproof up to 572°F, guarding against extreme temperatures and slippery surfaces. Electrical hazard defense protects against potential contact with live circuits, and an oil- and acid-proof sole guards against chemicals commonly encountered on job sites. Blundstone's SPS Max - XRD Technology adds shock absorption at heel and forefoot strike zones, and the washable, luxury footbed supports long hours with maximum comfort. With elastic sides and a molded TPU bump cap for added wear protection, the Extreme Series are the go-to safety choice for demanding industrial environments.