You can be seriously hurt if your shoulder belt is; too loose. In a crash, you would move forward; too much, which could increase injury. The- Page 35

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CAUTION:

You can be seriously hurt if your shoulder belt is
too loose. In a crash, you would move forward
too much, which could increase injury. The
shoulder belt should fit against your body.

To unlatch the belt, just push the button on the buckle.