Sera Anatomica is currently the only handmade leather saddle manufacturer in the United States. It was developed in 2007 by leveraging the many years of cycling experience and research cultivated by long-distance-based ultracyclist Tom Milton. Today, his family has taken over the development in San Diego, California, and each one is carefully handmade at a manufacturing plant in Wisconsin. When the bicycle and the person are integrated, the saddle is the most central part of the center of gravity. Sera Anatomica first focused on the movement of the human body when designing its comfortable saddle. Since both legs move separately on the bicycle, the idea that the saddle should match that movement created "THE SLOT (center hole)". This allows both ends of the saddle to move freely under the ischium, relieving stress on the seating surface. On this Sera Anatomica saddle, which is said to be the "most comfortable touring leather saddle in the world," you can easily cross hundreds or thousands of kilometers.