- Blundstone Footwear Size Chart - The steel toe design, heat resistance, and reliable slip-resistant outsole of the Blundstone® Work & Safety Cheslea Boots 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, Women's 13), width Medium. Please note that measurements may vary by size.