For other people with Karl and Müller, see Karl Müller.
Karl Müller (born 1952 in Roggwil TG) is a Swiss engineer and businessman. He is the creator of the Masai Barefoot Technology brand of rocker bottom shoes,[1] and holds a patent on his design.[2] Müller founded Swiss Masai (now known as Masai Marketing and Trading AG) in 1996 to market his new shoe concept.[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.[4]
Products sold by Kybun include shoe models that have a shock-absorbing, adaptive air cushion integrated into the shoe. Kybun further sells an elastic mat, as well as a treadmill that is made with a soft, springy material.