The interior materials only consist of best components to allow a comfortable wearing of tight and stiff carbon boots. The leather is made out of authentic and uncolored calf leather and ensures a pleasant feet temperature (with or without wearing skating socks). This is a big advantage compared to synthetic materials! Any odor is extremely reduced by authentic leather and also by the integrated Junker Skates cushions. The chosen high-quality cushioning materials are also used for orthopedic techniques and particularly help those customers with feet problems. They guarantee a good comfort despite a stiff carbon shell.