Zappos.com is proud to offer the Bates Footwear - C3 8 Side Zip (Black) - Footwear: The 'C3' offers comfort and ventilation to keep you feet cool on those hot summer days. ; Leather and ballistic nylon upper. ; Cambrelle lining is breathable. ; YKK nylon side zipper for easy on and off. ; C3 insole offers heel and arch support. ; Slip-resistant rubber outsole. ; Athletic cement construction. ; C3 technology (Cross Channel Circulation) circulates air within the boot while you move around by forcing air in to the sole which keep your feet ventilated. ; Shaft: 7 1 2 in ; Circumference: 12 in ; Weight: 1 lb 5 oz ; Product measurements were taken using size 8.5. Please note that measurements may vary by size.