McLaren’s engineering ingenuity, underpinned by the inherent strength and rigidity of carbon fibre, means that despite the removal of the fixed roof there is no need for additional strengthening; even the unusually slim but incredibly strong windscreen A-pillars first seen on the 720S Coupé remain. To provide enhanced rollover protection for occupants, fixed carbon fibre structural supports are integrated into the rear of the Monocage II-S, additionally providing the main anchor points for the roof system and the seatbelts. In the first-generation Super Series, steel supports featured and the switch to carbon fibre has contributed to the Rollover Protection Structure (ROPS) in the 720S Spider being 6.8kg lighter than in the 650S.