Laced rubber boots by Ilse Jacobsen, featuring a decorative D-ring at center back and logo on the shaft. These wellingtons are made of sustainably harvested natural rubber and have been cut by hand. This material can withstand temperatures down to -20 degrees Celsius. The rubber composition is 80% pure, natural rubber and 20% secret formula. Entirely PVC-free, these boots contain no animal by-products. If not treated regularly, natural rubber will develop a white surface over the years. This is simply because the rubber loses its essential oil. To keep your boots in great condition for many years to come, we recommend that you treat them once a month with oil.