Polyurethane boots that contains millions of tiny air bubbles making the boots lightweight and giving excellent thermal insulation.UPPER: Anatomic Polyurethane upperOUTSOLE: Easy cleaning Polyurethane outsole dust-proofLINING: Anti-bacterial sockFOOTBED: Removable insole made with an antistatic foam with extra grip printing. Good sweat managing for extra comfort.SPECIAL: Insulation -20C -4FCERTIFICATION: EN ISO 20347:2012 04 SRC CI