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Hi Pedro, unbalance occurs whenever the footprint of the center of gravity (COG) moves beyond the borders of the base of support (BOS). It may be helpful to see the illustrations. It is important to stress that the COG is very close to the rear border of the BOS, and this is exactly the reason why most falls occurs when COG crosses the rear border of BOS. By the way, why does a walker increase stability? Whenever a person is using a walker, he/she leans forward – this expands the BOS but especially shifts the COG forward far away from the rear border of the BOS. The sensors embedded in the shoe and the algorithms analyze in real time when fall is about to occur. In this event, B-Shoe will automatically react to regain balance. Any foot movement that does not cause balance problem will be disregarded. The shoe will certainly be aware of any foot movement but as mentioned, active reaction will take place only when necessary. Also, it is important to emphasize that B-Shoe has a look & Feel and behaves like a conventional/standard shoe except in the events of loose of balance when it has to actively react.