We love this new biker style rubber welly boot from Ilse Jacobsen. Made out of the finest single-estate 100% natural rubber from sustainable harvests. This pure, natural rubber is mixed with their own secret recipe, making the fundamental composition 85% pure, natural rubber and 15% secret recipe! Entirely PVC-free, Ilse Jacobsen boots contain no animal by-products and are completely vegan friendly. To make sure that your feet stay dry and comfortable, they have lined all Ilse Jacobsen rubber boots with a mixture of 60% viscose and 40% cotton. They have placed nice and warm inner soles in them, made of 45% viscose, 35% polyester & 20% poly-acrylic. Ilse Jacobsen rubber boots soles are made of oil-resistant lightweight EVA, withstanding temperatures down to -20 degrees Celsius, now with new non slip sole technology! Fit-roomy, may need to take a size down than normal.