Karl Müller (born 1952) is a Swiss engineer and businessman.

He is the creator of the Masai Barefoot Technology (MBT) brand of rocker bottom shoes,[1] and he holds a patent on the design.

[3] In 2007, he left the company on amicable terms and went on to found Kybun Corporation to market a newer "walk-on-air" shoe concept.

Kybun further sells an elastic mat, as well as a treadmill that is made with a soft, springy material.

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