The X-Class features a comprehensive array of safety features. The standard equipment includes seven airbags, internally vented disc brakes on the front and rear and i-Size attachment system for two child seats. The standard Lane Keeping Assist in the 4 cylinder models is changed for the X 350 d 4MATIC to Active Lane Keeping Assist, meaning if a driver unintentionally departs from the lane not only will pulsed steering wheel vibrations occur, but one sided braking is also applied to manoeuvre the vehicle back into its lane automatically. This compliments Active Brake Assist ensuring driver assistance systems are at the ready to simultaneously increase active safety and comfort. Additionally there is ESP trailer stabilisation, a tyre pressure monitoring system, cruise control, and a reversing camera or in the POWER line a 360° camera as standard.