These handmade rubber boots can withstand even the hardest torrential downpour. Ilse Jacobsen has chosen to make these rubber boots out of the finest single-estate 100% natural rubber from sustainable harvests. Entirely PVC-free, these boots contain no animal by-products. To make sure your feet stay dry and comfortable, these boots are lined with a mixture of 60% viscose and 40% cotton. In addition, they have nice and warm inner soles in them, made of 45% viscose , 35% polyester & 20% polyacrylic.