Harsh winters and low temperatures require warm footwear. The knee high boots are just a taller brother of Toecap Derbys. The crucial difference is in the lining sock; it is a 100% natural sheepskin. The warm sheepskin is full length, but is also used for the whole insole and tongue. To ensure durability, the heel part is made of long life nappa skin which makes it very easy to slip in. The upper is made of premium calfskin and is stitched down into a groove by the Blake construction. The leather soles are provided with anti-slide grips.