The T340 insoles are leather, vegetable-tanned, with an integrated active carbon layer for real comfort on your feet. The activated carbon layer massages and relaxes the foot, while the inside of the shoe acts as a natural deodorant. It absorbs moisture perfectly and dries quickly. In the evenings, it is recommended to take the insoles out of the shoe and place them in a dry warm place to dry, but not directly on a hot surface. The insoles provide comfort and protect the shoes from rapid wear and tear.