Saying “FOS”, it represents “Factor of Safety” and “Feel Optimism Surrounding”. We are attentive to quality—both product quality and your exercise quality. We involve in designing and making products which can reduce risk of injury due to exercise and try to have less harm to the environment. Moreover, we hope to bring positive change in your life. Exercise boosts your body’s fitness and also your mood. Then the following step is to share your optimism.