Slim-fit stretch denim jeans. Features Cotton Flex-Denim HI-ART reinforcement material at hip & knees Certified to class A Certified Level 1 knee protectors Can be supplemented with hip protectors HI-ART® HI-ART is a proprietary material, used in especially exposed areas to increase abrasion resistance. It makes leather 200 percent stronger & textiles no less than 500 percent stronger.