Noramax is made from Polyurethane, that contains millions of tiny air bubbles making the boots lightweight and giving excellent thermal insulation. In addition, hydrolysis protection and anti-UV additives make Noramax hardwearing and durable, lasting up to 3 to 4 times longer than traditional PVC and rubber boots. Safety Standards Approved: EN ISO 20345:2011 & S5 CI SRC.