These handmade rubber boots can withstand even the hardest torrential downpour. Made specifically to deal with wind and water, Ilse Jacobsen rubber boots can help you love the rain. Made out of the finest, sustainably harvested, single-estate, 100% natural rubber. This pure, natural rubber is mixed with a secret recipe, making the fundamental composition 80% pure natural rubber and 20% secret recipe. Entirely PVC-free with no animal by-products. The result is a sturdy and reliable companion for rainy days. To make sure that your feet stay dry and comfortable, the boots are lined with a mixture of 60% viscose and 40% cotton. In addition to this, they have nice and warm inner soles in them made of 45% viscose, 35% polyester & 20% polyacrylic. The cold won't ruin your rubber boots - the soles are made of lightweight EVA, withstanding temperatures down to -40 degrees Celcius, and the rubber uppers withstand temperatures down to -2.