Ultra is a supple children's winter boot made of high-tech PU material that keeps your feet warm no matter how cold it gets. Ultra is quick and easy to take off and on and is easy to clean. They are made of a flexible polyurethane material called Elastopan® and are a 100% PVC-free, degradable material containing millions of tiny air bubbles. The material is 40 percent lighter than PVC and rubber and provides 2.5 times more insulation than regular PU boots. In combination with the airy, high-quality wool blend lining, the Ultra feet keep warm down to as low as -20 ° C. Vikings Nordic reads leave room to move their toes and make the boots feel comfortable all day. The thick PU sole with strong pattern gives good grip. This unique winter boot is available in four lovely color combinations and is very much appreciated by both children and parents.