Abstract: This paper presents a virtual try-on system of footwear in mixed reality. A user can virtually put on 3D shoe models on his/her feet in a video stream. Real time object tracking integrated with depth sensing technologies enables that the shoe models stay correctly with respect to the positions of the moving feet during the try-on process. The system facilitates evaluating consumer products that are highly interactive with the users. It thus serves as an essential element in realizing human-centric design. This study also demonstrates a new application of depth sensing technologies in product design.