Ilse Jacobsen's short rubber boots with an ice-resistant outsole with a rough surface, offering the best possible traction. Buckles, straps and small studs adorn the upper of these biker-inspired boots. These handmade rubber boots are made from the finest natural rubber from sustainable harvests. This material can withstand temperatures as low as -20 degrees Celsius. Completely PVC free, these boots contain no animal by-products. Rubber composition: 52% pure natural rubber and 48% secret formula. Lining composition: 60% cotton and 40% polyester. Insole composition: 60% cotton and 40% polyester. Outsole: lightweight EVA.