The steel toe design, heat resistance, and reliable slip-resistant outsole of the Blundstone BL990 Work Chelsea Boot will keep you safe in a variety of work environments. American Podiatric Medical Association Seal of Acceptance. Blundstone recommends ordering a half size up for a Wide fit. Water-resistant leather upper. Elastic gore on sides for easy on and off. Nonmetallic PU midsole is penetration resistant. Shock Protection System (SPS) disperses shock at the heel strike and reduces skeletal stress on the feet, knees, and vertebrae. Extra-heavy duty rated. Xtreme comfort PU/foam removable footbed with PORON XRD forepart inserts. Broad-fitting toe cap. Oil and acid-resistant outsole. Sole is resistant to organic fats and oils. Outsole is heat resistant to 580°F. Slip-resistant thermo urethane outsole is highly resistant to hydrolysis. Steel toe meets ASTM 2413-11 M I/75 C/75 EH standard specifications for performance requirements for foot protection. Measurements: Weight: 1 lb 13 oz Circumference: 10 1 2 in Shaft: 5 1 2 in Product measurements were taken using size AU 10 (US Men's 11), width Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.