Opananken Men's Super Care Bardolino Vegetable Tanned Sheep Leather Boot Vegetable Tanned Sheep Leather Removable insole, which allows using customized insoles. Sheep vegetable tanned leather upper. Leather thickness rigorous controlled between 0.9 to 1.1 mm. Modern vegetable tanning is an improved traditional craft process which gives the leather unique characteristics. It is the most natural and environmental-friendly tanning process resulting in a very particular valuable product that is not the same for their entire life because they continuously change, for the better, looking great and natural as time goes. High-quality naturally tanned leather lining, providing maximum softness. No pigments, improving the sweat absorption and avoiding bad scents. Leather thickness rigorous controlled between 0.9 to 1.1 mm. The cattle leather lined polyurethane insole has a permanent memory, which never deforms. They are anatomical and fill in all the arch of the foot, increasing the impact absorption. Sheep Leather is unbeatably smooth due to its supple texture which makes it excellent for medical shoes. It features excellent insulating properties and resistance against static electricity.Removable Insole