Integrated Seatbelt System: Through the interaction of the three-point seatbelt, pyrotechnic pre-tensioner, belt force limiter and anti-submarining protection on the seat itself, the BMW restraint system guarantees optimum protection in the event of a collision.

Compared with conventional protection systems, the integrated seatbelt system can reduce the force of an impact on you and your passengers by up to 50 per cent.

The pyrotechnic belt pretensioner, for example, incorporates a pyrotechnical actuator which is able to react to an impact with astounding speed, retracting the belt latch within fractions of a second, while at the same time tightening the shoulder and lap belts.
The anti-submarining protection is a wedge-shaped component at the front end of the seat that helps to ensure that you or your front passenger cannot slide forward beneath the lap belt.