LaCrosse® Flex 3™ Steel Toe Boots Flex3™ Boots provide superior resistance to animal fats, acids, oils, greases and chemicals, featuring an upper made of a special urethane/PVC compound with Elvaloy® and polymeric plasticizers. A soft orange compound, shot throughout the Power-Loc™ outsole, offers excellent slip resistance on indoor surfaces. Steel shank supports arch, and removable EVA insole cushions foot.