Approved for flight by the U.S. Army and U.S. Air Force and built for comfort and safety, the C790 ST contains both an ASTM certified/EH rated steel toe and a GORE-TEX lining that not only makes this boot waterproof, but also petroleum, oil and lubricant (POL) resistant. This lace-to-toe design also allows for a better, customized fit for increased stability and support.