The 561 is our toughest boot, designed with a higher cut for added coverage and manufactured with a full leather upper. Bearing the mighty Vibram® sole, this boot can withstand temperatures up to 300°C. The exterior may be fortified but look no further for comfort as the interior of the boot includes the OrthoTec Poron® footbed which enhances comfort with its shock absorbing properties and anatomical arch support. This boot is a confident choice for boiler makers, miners, grinders, road workers or anyone who needs protection from the heat. UK Sizes 5-13 (half sizes 6.5–10.5) 200J steel toe cap Heat, oil & acid resistant Vibram XS Work outsole Moulded PU scuff cap for longevity YKK zipper w/ full length ZipGuard SRC slip resistance Silicone AbrasionGuard AirZone Comfort System Footbed with arch support Dri-Freeze® lining that dissipates heat Coats NylBond stitching Padded tongue and collar Certified to Type 1 AS/NZS 2210.3.2009 class 1 Sizing All Mongrel Boots are listed in AUS Mens sizes. If a Ladies boot is required, please select the size two sizes smaller than you would normally wear. (e.g. Lades size 8 is the equivalent of Mens size 6).