If it’s durability and performance that you’re looking for, the Air 9″ All-Leather Waterproof Side Zip is the boot for you. The all-leather waterproof upper provides the ultimate protection from the elements, and the lightweight custom-molded phylon midsole delivers the comfort and performance you’ll need to take on any shift. Its features include a slip and oil-resistant quiet non-marking rubber outsole that meets the ASTM F489-96 test standards, a custom molded phylon midsole for lightweight comfort and cradled support, internal air technology for increased comfort, a texon stability platform insole for lateral support and torsional stability and is airport friendly with nylon shank. Other features include waterproof lining with a full bootie construction, a removable custom fit EVA orthotic for all day comfort, and foam padding in tongue and collar for protection and increased breathability. All waterproof models are blood borne pathogen-resistant.